Questions on Algebra: Trigonometry answered by real tutors!

Tutors Answer Your Questions about Trigonometry-basics (FREE)

Question 429451: Please find sin cos and tan.
sin (theta) = 1 third. 1/3
Click here to see answer by poliphob3.14(115)

Question 429559: multiply and simplify using the trigonometric identities (sin beta + cos beta) power of 2
Click here to see answer by htmentor(807)

Question 429492: cosx*tgx+sin2x=2
Click here to see answer by Alan3354(31518)

Question 429591: 5=3+7cos((3.14/4)(x-3))
Click here to see answer by ewatrrr(10682)

Question 429676: Determine the phase shift of y=sin(3x-2 pi)
Click here to see answer by Alan3354(31518)

Question 429675: How do you work out the following problem to find two points?
y=2tan2x
Click here to see answer by Alan3354(31518)

Question 429714: Solve for h
Tan 75=(h/510-h)
Assignment due by 7:15 today,need immediate help if possible. Thank you
Click here to see answer by Gogonati(817)

Question 429856: Suppose alpha (a) is an angle in Quadrant II and beta is an angle in Quadrant III such that sin(a)= 4/5 and cos(b)= -3/4
A) Find the exact value of cos(a)
B)Find the exact value of sin(b)
(a stands for alpha and b for beta)
I didn't exactly comprehend my teacher's explanation so any help will help me a lot. Thanks in advance if anyone helps. (also, sorry if this is cramming too many problems....?)
Click here to see answer by lwsshak3(6755)

Question 429870: cos(x+(π/2))-cos(2x)=0
Click here to see answer by robertb(4012)

Question 429870: cos(x+(π/2))-cos(2x)=0
Click here to see answer by Gogonati(817)

Question 429905: Please help me solve this trigonometry problem. I have to "Find the exact values of x and y." Please help me.
The problem is a 45-45-90 triangle and the two legs have values of 13 and i need to find the hypotenuse. I tried to work on it and I got: . Im not sure if I am supposed to leave it like that or not. is that the final answer?
Click here to see answer by stanbon(57962)

Question 430337: word problem:
A double axel is a figure-skating jump in which the skater makes 2.5 revolutions in the air. If a skater is in the air for 0.66s during a double axel, what is her average angular speed to the nearest degree per second?
this is how i solved it, is it right?
2.5 revolutions = 900 degrees
so 900 divided by .66 equals 1364%
Click here to see answer by Alan3354(31518)

Question 430524: how do i go about finding the answer to 4 x to the 2nd power + 81 - 36x=
Click here to see answer by Alan3354(31518)

Question 430452: solve
3cosec^2 x-4=0
sqt3 cot x-1=0

for the interval 0 to 2pi
Click here to see answer by Alan3354(31518)

Question 430649: Find the value of sin58(degrees) 25'(minutes)to the nearest thousandth
Click here to see answer by Alan3354(31518)

Question 430750: I am having trouble understanding how to find 2 real #'s between -2pi and 2pi that determine the point on the unit circle. i know 1 time around the unit circle is 2pi and one time around the unit circle clockwise is -2pi. I also need help to determine suppement of 5pi/12 and complement of 3pi/8. I am looking at my book and teacher's notes and I don't see it explained at all. Thanks so kindly for your time.
Click here to see answer by stanbon(57962)

Question 430780: Please any answer is appreciated for the following:
Prove that cos[3*pi/2 + x] = sinx
THank You
Click here to see answer by richard1234(5390)

Question 430840: I am stuck on the following question:
Solve for x in the equation: (1+sinx)/cosx + cosx/(1+sinx) = 4 for 0<=x<=2pi rads
Any help is appreciated
Thank You
Click here to see answer by lwsshak3(6755)

Question 431008: how do i evaluate arccos(cos 7pi/2) using the properties of inverse functions?
Click here to see answer by richard1234(5390)

Question 431148: Show an evaluation of sin 120 degrees using the trigonometric addition formulas.
Show an evaluation of sin 120 degrees using the double-angle formulas.
Click here to see answer by lwsshak3(6755)

Question 428515: Im working on trigonometric function and not sure how solve or graph these the problem is y= 3 cot(x+pie over 4). I have tried to understand but i am lost thank you
Click here to see answer by lwsshak3(6755)

Question 428088: find the exact value of cos 225 degrees
Click here to see answer by lwsshak3(6755)

Question 431468: Use the sum angle formula to simplify cos(x + 270○)
Click here to see answer by Gogonati(817)

Question 431469: Derive the half angle formula for sin( u/2 ) by following the steps below.
(a) Use the sum angle formula to write cos(2x) in terms of powers of sin(x)
and cos(x) .
(b) Use a trig identity to rewrite cos(2x) in terms of just powers of sin(x):
(c) Solve the formula in part (b) in terms of sin(x), and not a power of
sin(x).
(d) Substitute x = u/2 into the formula in part (c).
Click here to see answer by richard1234(5390)

Question 431693: how do you solve this help show me please so i can understand
Click here to see answer by richard1234(5390)

Question 432419: Find angle a of a triangle with sidec=13 and side b =12
Click here to see answer by belle3833(46)

Question 432502: secx-cosx=tanxsinx
Click here to see answer by Alan3354(31518)

Question 432502: secx-cosx=tanxsinx
Click here to see answer by MathLover1(6812)

Question 432307: sin[arccos1/2 + arcsin(-1)]
Click here to see answer by lwsshak3(6755)

Question 432271: there are four values of x in the interval 0≤ θ ≤360 that satisfy the equation 2 sin 2x+cosx=0. Which of the following is NOT a solution to this equation?
a)14.5
b)90
c)194.5
d)270
Click here to see answer by lwsshak3(6755)

Question 432268: Find m(x) in the interval180(degrees)<(or equal)x >(or equal) 270(degrees) that satisfies the equation 2cos x+1=0
Click here to see answer by lwsshak3(6755)

Question 433087: What is tan 300 degrees/ cosine 540 degrees
Click here to see answer by ewatrrr(10682)

Question 433250: Can someone explain to me how the exact value of Sin^(-1) [Sin(-7pi/6)] is pi/6? I got -1/2...
Click here to see answer by josmiceli(9817)

Question 433312: verify idenity
csc x = (sin x)/2(1 + cosx) + (sin x)/2(1-cosx)

Click here to see answer by katealdridge(100)

Question 433359: How to establish this identity? Csc(theta) x Cos(theta) = Cot(theta) ?
Click here to see answer by Alan3354(31518)

Question 433307: verify the idenity
sec^2x – csc^2x = (tan x – cot x)/(sinx*cosx)

Click here to see answer by Alan3354(31518)

Question 433310: verify identinty
sec^4x – (tan^4x + sec^2x) = sec^2x · sin^2x

Click here to see answer by Alan3354(31518)

Question 433309: sec^4x – sec^2x = tan^4x + tan^2x
Click here to see answer by Alan3354(31518)

Question 433311: verify idenity
(cos^4x – sin^4x)/(cosx + sinx) = cos x – sin x

Click here to see answer by belle3833(46)

Question 433403: sketch the graph of
y=5sin (x-pi/3)
and
y=7cos(x+pi/6)
Click here to see answer by Alan3354(31518)

Question 433559: verify the question
sec^2x-csc^2x=(tanx-cotx)/(sinx*cosx)
Click here to see answer by MathLover1(6812)

Question 433558: verify the idenity
sec^2x – csc^2x = (tan x – cot x)/(sinx*cosx)
Click here to see answer by Edwin McCravy(8999)

Question 433555: verify the idenity
sec^4x – sec^2x = tan^4x + tan^2x''
Click here to see answer by Edwin McCravy(8999)

Question 434030: Use an addition or subtraction formula to write the expression as a trigonometric function of one number, and then find its exact value.
cos(30)cos(60)- sin(30)sin(60)
Click here to see answer by robertb(4012)

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