Questions on Algebra: Trigonometry answered by real tutors!

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Question 217331: Prove this identity
=
Click here to see answer by drj(1380)

Question 217335: Prove cot(45°-A) =
Hence show that cot15° = 2 + sqrt3
Click here to see answer by jsmallt9(592)

Question 217858: find the vertex and the axis of symmetry of the parabola
y=6x2+11x
Click here to see answer by checkley77(7049)

Question 218202: can anyone help me with these question pls....thanks..
1. From a point due west from the base of the building, the angle of elevation to the top is 65 degrees. At a point 62 meters further, the angle of elevation is 54 degrees. How tall is the building?
Click here to see answer by Theo(675)

Question 218320: graph the function y=sin x on the interval -pi/2 <= x <= pi/2
Click here to see answer by jim_thompson5910(13794)

Question 218319: Nathaniel pulls a sled along level ground with a force of 30 newtons on the rope attached to the shed. if the rope makes an angle of 20 degrees with the ground when it is pulled taught, find the horizontal and vertical components of the force.round to the nearest tenth
Click here to see answer by solver91311(5072)

Question 218326: find the ordered pair that represents: -3w(arrow above w) if
w(arrow above)={6, -4}
Click here to see answer by jim_thompson5910(13794)

Question 218331: write parametric equations of y=5x-2
Click here to see answer by jim_thompson5910(13794)

Question 218332: graph the function y= 2cos(theta + pi/3)
Click here to see answer by jim_thompson5910(13794)

Question 218325: write XY(line above)as the sum of unit vectors for
X(8, 2, -9) and Y(-12, -1, 10)
Click here to see answer by RAY100(1637)

Question 218272: find sin(sin^-1 1/4)
Click here to see answer by jsmallt9(592)

Question 218323: if 0 < (theta) < 90 and tan(theta)= sqrt3/2 find cos(theta)
Click here to see answer by jim_thompson5910(13794)

Question 218330: find the value of sin(theta) in standard position if a point with coordinates
(-3, 2) lies on its terminal side.
Click here to see answer by RAY100(1637)

Question 218349: solve 6=e^0.2t. round your answer to the nearest hundredth
Click here to see answer by Alan3354(6080)

Question 218345: simplify 1-i / 3+2i
Click here to see answer by user_dude2008(716)

Question 218357: evaluate (sqrt289)^-3. express your answer as a fraction
Click here to see answer by jim_thompson5910(13794)

Question 218270: find the measure of the reference angle for 400 degrees
Click here to see answer by drj(1380)

Question 218321: if sin(theta)=3/5 and (theta) is a second quadrant angle, find tan2(theta)
Click here to see answer by Alan3354(6080)

Question 218360: find the balance after 15 years of a $2500 investment earning 5.5% interest compouunded continuously
Click here to see answer by checkley77(7049)

Question 218411: I'm at the review section of my Trig book and to be honest, I don't remember what to do here. I think one has to square the root away and square the other side, and subtract the 44, but then I'm not sure. I'd rather not have x^2-44 over 7 equals x, but could that be right?
= x
Click here to see answer by josmiceli(3008)

Question 218492: Hello. I am stuck on the following problem:
Amy Pilot observes the angle of depression of a point on a landing field to be 28 degrees and the plane's altitude is 1370 meters. What is the distance from Amy to the observed point on the landing field? My T84 seems to be stuck

Click here to see answer by stanbon(26274)

Question 218281: write an equation in slope-intercept form of the line with parametric equations: x=2+3t and y=4+t
Click here to see answer by drj(1380)

Question 218745: find the variation constant and an equation of variation for the given situation. problem: y varies inversely as x, and y = 12 when x =5
Click here to see answer by stanbon(26274)

Question 218747: find the variation constant and an equation of variation for the given situation. problem: y varies inversely as x, and y = 1/5 when x = 35
Click here to see answer by stanbon(26274)

Question 218789: Test algebraically whether the function is even, odd, or neither even nor odd. Then check your work graphically, where possible, using a graphing calculator. problem: f(x)=1/x^2
Click here to see answer by josmiceli(3008)

Question 218791: Write an equation for a function that has a graph with the given characteristics. problem: The shape of y = x^3, but upside-down and shifted right 5 units
Click here to see answer by josmiceli(3008)

Question 218290: find the value of tan^-1(1/ sqrt 3). express your answer in radians
Click here to see answer by chibisan(120)

Question 218882: Find an equation of variation for the given situation. problem: y varies jointly as x and z and inversely as w, and y=3/2 when x=2, z=3, and w=4
Click here to see answer by RAY100(1637)

Question 218909: find the area of a sector if the central angle measures 5pi/6 radians and the radius of the circle is 8 centimeters. round to the nearest tenth.
Click here to see answer by RAY100(1637)

Question 218922: find the distance between points at (6, -3) and (-1, 4)
Click here to see answer by RAY100(1637)

Question 218932: write the standard form of the equation of the circle that is tangent to x= -2 and has its center at (2, -4)
Click here to see answer by RAY100(1637)

Question 218927: use a calculator to find 1n36.9 to the nearest ten thousandth
Click here to see answer by RAY100(1637)

Question 218966: express 8i in polar form
Click here to see answer by stanbon(26274)

Question 218961: simplify:(-1-2i)+ (4-6i)
Click here to see answer by stanbon(26274)

Question 218963: graph the system of equations. then solve: x^2 + y^2=10 and xy=3
Click here to see answer by checkley77(7049)

Question 219381: I need help with the problem
f(x)=2x-7
g(x)=(x+2)/2
find f(g(x))
Click here to see answer by rapaljer(3620)

Question 219521: write 3x-6y= -14 in polar form.round to the nearest degree
Click here to see answer by jim_thompson5910(13794)

Question 219547: express 2(cos300 dwgrees + i sin300 degrees) in rectangular form
Click here to see answer by jim_thompson5910(13794)

Question 219547: express 2(cos300 dwgrees + i sin300 degrees) in rectangular form
Click here to see answer by jsmallt9(592)

Question 219552: write the polar equation (theta)=45 degrees in rectangular form
Click here to see answer by jsmallt9(592)

Question 220033: find all solutions of the equation in the interval [0,2PI).

-I tried putting the equation in to the graphing calculator and the answer i keep on receiving is 2pi/3 and 4pi/3. which I'm not sure is correct if you would please answer me as soon as possible because I'd really like to understand thank you in advance
Click here to see answer by stanbon(26274)

Question 220243: The expression below is the factorization of what trinomial? Enter the trinomial in descending order. Enter exponents using the caret ( ^ ). For example, you would enter x2 as x^2.
(5x + 4)(9x + 9)

Click here to see answer by rfer(2688)

Question 220370: what's 5 pi over 4 in degrees?
Click here to see answer by rapaljer(3620)

Question 220370: what's 5 pi over 4 in degrees?
Click here to see answer by jim_thompson5910(13794)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790