Questions on Algebra: Trigonometry answered by real tutors!

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Algebra: Trigonometry

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Question 228234: Use the identities and/or to simplify
Click here to see answer by chibisan(120)

Question 229171: Solve using the quadratic formula.
3 = 11x - 6x(squared)

Click here to see answer by Alan3354(6097)

Question 229172: Solve using the quadratic formula.
7x(squared) + 4x = 2
Click here to see answer by solver91311(5072)

Question 229170: Solve using the quadratic formula.
2x(squared) - 9 - 6x = 0
Click here to see answer by solver91311(5072)

Question 229169: Solve using the quadratic formula.
x(squared) - 16x - 57 = 0
Click here to see answer by solver91311(5072)

Question 229168: Solve using the quadratic formula.
x(squared) + 2x - 3 = 0
Click here to see answer by solver91311(5072)

Question 229280: solve the following equation for the given value of x:
y= cos x; for x = 4 pie
Click here to see answer by rfer(2688)

Question 229280: solve the following equation for the given value of x:
y= cos x; for x = 4 pie
Click here to see answer by Alan3354(6097)

Question 229350: i need help rewriting the expression as a square of a binomial
x^2-38x+361
Click here to see answer by checkley77(7072)

Question 229363: x^2-38x+361
Click here to see answer by edjones(3299)

Question 230137: sinxtanx=secx-cosx
Click here to see answer by algebrapro18(206)

Question 230137: sinxtanx=secx-cosx
Click here to see answer by Theo(675)

Question 230151: please help, prove: sin^4x-cos^4x/sin^2x=1-cot^2x
Click here to see answer by Theo(675)

Question 230382: How do I write a model for the given sunset information using time (t) as a function of days (d) if a year has 365 days.
Date Day Sunrise Sunset
Mar 20 80 6:14 6:22
June 20 172 4:44 7:38
Sept 22 266 5:57 6:06
Dec 21 356 7:25 4:52

Click here to see answer by stanbon(26297)

Question 230149: 1/1-cos^2x=1+cot^2x please prove
Click here to see answer by chibisan(120)

Question 230555: what is the sine of angle A
the triangle is a right angle triangle with a hypotenuse of 10 , opposite 6, and adjacent 8
angle A is between 10 and 8...
Click here to see answer by chibisan(120)

Question 230148: please prove: 1-cosx/1+cosx=(cscx-cotx)squared
Click here to see answer by chibisan(120)

Question 230621: If 0 < x < pi/2 and tanx = 15/8, find cos2x.
Click here to see answer by jsmallt9(594)

Question 230618: How do I solve for x when cos^2 x = sin x?
Click here to see answer by scott8148(3385)

Question 230712: the hypotenuse of a right triangle PQR is 16 feet long. the sine of angle P is 3/5, about how many feet long is QR ?
TRIANGLE
P
|.
|.....
|.......
|.........
|...........
|.............
|------------- R
Q
Click here to see answer by stanbon(26297)

Question 230729: Hello, I need help simplifying this trigonometry function:

Thank you~
Click here to see answer by stanbon(26297)

Question 230798: Hi,
I have a "Trig Identity" problem that I'm to verify. I know they are equal by substituting in a value, but I don't know how to approach it. I thought using a conjugate was the way, but it got me nowhere. Here is the problem:
(cotX * cosX)/(cotX + cosX) = (cotX - cosX)/(cotX * cosX)
Thank you,
Lynn
Click here to see answer by Alan3354(6097)

Question 230896: Please help me with this problem:
Carefully describe how to manipulate the graph of y = sin t to get the graph of y = 3sin (4t - pi/6) - 5.
Thank you!
Cindy
Click here to see answer by Alan3354(6097)

Question 231164: The terminal side of angle theta in standard position lies on the given line in the given quadrant. Find sin theta, cos theta and tan theta.
2x + 3y=0; quadrant IV
Click here to see answer by jsmallt9(594)

Question 231308: p=2w+2l. l=3w. what is p in terms of l?
Click here to see answer by stanbon(26297)

Question 231659: every time i try this problem: my answer is undefined
Click here to see answer by kensson(7)

Question 231658: every time i try this problem: my answer is undefined
Click here to see answer by jsmallt9(594)

Question 231967: Use the sum or difference identities to find the exact value of sin 105 degrees.
Click here to see answer by Alan3354(6097)

Question 232030: find a polynomial function of degree 3 with the given numbers as zeros.
1+4i,1-4i,-1
Click here to see answer by Alan3354(6097)

Question 232037: list all possible rational zeros of the function
f(x)= 3x^3-x^2+6x-9
Click here to see answer by stanbon(26297)

Question 232033: Suppose that a polynomial function of degree 4 with rational coeficients has the given numbers as zeros. find the other zero(s).
-2,3,4,1-i
Click here to see answer by stanbon(26297)

Question 232041: determine the amplitude,period, and phase shift of each function. then graph one period of the function.
y=3sin(2x - pi/2)
Click here to see answer by stanbon(26297)

Question 232074: FIND TAN OF THETA AND COT OF THETA IF SEC OF THETA = 0 AND SIN OF THETA < 0
Click here to see answer by Alan3354(6097)

Question 232067: Please Help. Simplify 1-csc^2 theta/cot^2 theta. Thank you so much!
Click here to see answer by Alan3354(6097)

Question 232058: Find sec theta if tan theta=1/4 and 180Degrees< theta <270degrees. Thankyou!!
Click here to see answer by chibisan(120)

Question 231972: Use the identities to find the exact value of the remaining trigonometric functions if sin x = -5/13 and tan x = -5/12.
Click here to see answer by chibisan(120)

Question 232305: 1.state the general solution to the equation sec2x=-3
2. use an algebraic approach to solve the equation cos3x=-1/2
Click here to see answer by stanbon(26297)

Question 232804: Please help prove identity
csc2x=tanx+cotx/2
i started off with:
csc(x+x)
1/sin(x+x)=
1/sinx+sinx=
Click here to see answer by Alan3354(6097)

Question 232801: please help prove 1+cosx/sinx=cot(x/2)
i tried starting with:
1+cosx/sinx=cos/sin(x/2)
=+/-square root 1+cosx/2/sin
then i got confused
Click here to see answer by jsmallt9(594)

Question 232805: Please help prove identity:

thank you
Click here to see answer by eggsarecool(32)

Question 232731: 1-(cosB-sinB)^2=sin2B
Click here to see answer by chibisan(120)

Question 232312: verify that (sinx+cosx)^2 =1+sin2x. show all of your steps clearly?
Click here to see answer by chibisan(120)

Question 233229: How do you find the angle PRT when Angle feda is equal to thirty degrees and hypotenuce is four
Click here to see answer by Alan3354(6097)

Question 233386: A car travels along a straight road, heading east for 1 h, then traveling for 30 min on another road that leads northeast. If the car has maintained a constant speed of 40 mi/h, how far is it from its starting position? Round your answer to 2 decimal places.
Click here to see answer by jsmallt9(594)

Question 233384: Find the angle θ. (Use either the Law of Sines or the Law of Cosines, as appropriate.) (Round your answer to one decimal place.)
a = 12, c = 6, angleC=25 degrees. find thetha in degrees

Click here to see answer by stanbon(26297)

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