trigonometry1

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trigonometry1 Questions and Answers

Solve the equation 5sinx=4cosx

Prove the following identity: cos x + cos 2x + cos 3x = cos 2x(1 + 2cos x)

Given 4cosx+2sinx=0 find tan2x

how to evaluate cos13pi/6 and sin37pi/4?

find the value of cosine function tan θ = -2/3 and angle θ lies in the second quadrant, what is the value of cos θ

If sin B=1/4, pi/2 < B < pi, find the exact value of sin 3B

Prove the following identity: cos4x - sin4xcot2x = -1

trigonometryGiven that sina + sinb =1 and cosa + cosb = 1/2 calculate cos(a-b) .

finding a value sin A=?   cos A = -(3/5) 90 degrees < A < 180 degrees  

What are sin x, tan x, cot x, if 180<x<270 and cos x=-4/5?

Solve equation tan^2x-8tanx+12=0

Prove the following identity: (1+ sin x + cos x) / (1+ sin x - cos x) = cot x/2

How do we derive the expansion for sin 3x?

math equation Solve for y 11 sin^2y = 13-sin^2y y is in the interval (0,2pi)

Prove that sin^4 x+cos^4 x+(sin^2 2x)/2=1

Tangent of double angle calculate the tangent of double angle sinx+cosx=1, tan2x=? cos2x=?

Prove the identity (3secx+3cosx)(3secx-3cosx)=9(tan^2x+sin^2x).

What is the value of sum of sqrt2/2+sinx=?

For 0<x<180 verify the monotony of the function xcosx+sin(-x).

math Verify if sin15=(6^1/2-2^1/2)/4.

(sinB)-3sinB+2=0 where 0 less or equal to B less or equal to 2 pie? solve the equation.

cosθsinθ(cotθ+tanθ)

What is x if cos^2(x/2)-2cos^2x=(3/2)*square root2(1+cosx)+2sin^2x?

Given 0=<x<2pi find the roots of the equation sinx=-1/2.

finding an angle what is the x angle if 2sin2x+square root 2=0?

What is the angle x if the identity sin2x-(cos 2x)/2 -1/2=cosx-2cosx*tanx?

Given sin x + cos x = 1, what is tan(x+x)?

Prove the following identity: (tan^4)t + (tan^2)t + 1 = [(1 - (sin^2)t * (cos^2) t] / (cos^4) t   I asked this same question before but the answer was not very clear. Could you please explain it again.

Exact value. Find the exact value of the expression sin(60+210).

Evaluate the limit of sin x + cos x, if x->pi/3?

Find the value of a specific angle Calculate cos 165

What is x if (1+cos2x)/2=sin(-2x)?

How to find all solutions of equation (2*cosx-square root3)(11sinx-9)=0?

calculate the sum sin x+square root(1-sin^2x)

Write the difference in tanpi/4-cosx as a product?  

Prove the identity cotx*sinx=cosx/(cos^2x+sin^2x)

What is sin^2x if sinx=3cosx ?

Determine the angle t from the identity sin^2t=4/25 .

Solve the equation tan^2x=8-8secx.

Given cot x=1/5, what is the value cos^2 x?

Calculate the expression sin^-1(sin(5pi/3))+tan^-1(tan(2pi/3))?

Solve the equation 5cos^2x-6tanx*cosx=cos^2x-5sin^2x-1.