Verify that the equation is an identity. cos (x+y)+ cos (x-y) = 2 cos x cos y cos (x +y)+ cos (x - y) = 0 +O (Type the terms of your expression in the same order as they appear in the ori (Do not combine like terms.) = 2 cos x cos y Use the even-odd identities. Use the Pythagorean identities. Use the quotient identities. Use the sum and difference identities.

Q: 3 tan 4 3 - 3 tan(0) 1 + tan(0) %3D - 3 tan(0) 3 tan - 0) = tan(A)

A:

Q: 8. cos x+- +sin x- 3 6.

A: According to the guidelines I have to solve only first question. We can solve this problem…

Q: Show that cos theta/ sec theta- tan theta = 1+sin theta.

A:

Q: sin y 2 1- cos y COS

A:

Q: Determine if each equation is an identity by graphing each side v sin² (x)+cos² (x) sin(x) csc (x)…

A: An identity is an equation which is satisfied for all 'x' values in the domain.

Q: Evaluate: 2sin(3i)cos(3i)

A: Given  2sin(3i)cos(3i) To solve we use following properties: 2sin(θ)cos(θ) = sin(2θ) sin(iθ) =…

Q: Evaluate cos(5)

A: Given trignometric expression cos( 5π6 )

Q: Evaluate 1 dx 3 sin x – 4 cos x -

A:

Q: Find an algebraic expression that is equivalent to the expression. Show all work on a separate sheet…

A:

Q: Evaluate the expression without using a calculator. (Assume the variable represents a positive…

A: We have to use formula for  cos(2θ)  =  ( 2*cos2(θ) - 1 )

Q: Find the exact value of cos(4x) if tan(x) = == -2,7 <y<T.

A:

Q: Simplify the following expression. csc (3) 4 CoS sin CS

A: Given, The expression cossin-114-csc-13 We have to simplify the above expression.

Q: Cos 12

A:

Q: tan(A + 2B) – tan(A – 2B) 1 + tan(A + 28)tan(A – 2B)

A: Put X = A+2B and Y = A- 2B  And use the formula