# Pre Cal

posted by .

simplify the expression 2sin^2 t + cos^2 t-2

• Pre Cal -

2sin^2 t + cos^2 t-2
=2sin^2t + 1 - sin^2t - 2
=sin^2t - 1

which could be factored to
(sinx+1)(sinx-1)

## Similar Questions

1. ### pre-cal

Simplify the given expression........? (2sin2x)(cos6x) sin 2x and cos 6x can be expressed as a series of terms that involve sin x or cos x only, but the end result is not a simplification. sin 2x = 2 sinx cosx cos 6x = 32 cos^6 x -48
2. ### trig

2sin(x)cos(x)+cos(x)=0 I'm looking for exact value solutions in [0, 3π] So I need to find general solutions to solve the equation. But do I eliminate cos(x), like this... 2sin(x)cos(x)+cos(x)=0 2sin(x)cos(x)= -cos(x) 2sin(x) = …
3. ### Pre Calc.

Use the sum or difference identity to find the exact value of sin255 degrees. My answer: (-sqrt(2)- sqrt(6)) / (4) Find the value of tan (alpha-beta), if cos alpha= -3/5, sin beta= 5/13, 90<alpha<180, and 90<beta<180. My …
4. ### Math pre cal

prove the following identity cos^4X - sin^4X = 1-2sin^2X
5. ### Precal

I do not understand how to do this problem ((sin^3 A + cos^3 A)/(sin A + cos A) ) = 1 - sin A cos A note that all the trig terms are closed right after there A's example sin A cos A = sin (A) cos (A) I wrote it out like this 0 = - …
6. ### Trig

simplify the expression to a single term: (1-2Sin^2 X)^2 + 4sin^2 X Cos^2 X I'm not sure how to start this or which identities to use. Any suggestions?
7. ### Pre-calc/Calc

Which expression is equivalent to sin(3x) + sin x?
8. ### Pre-Cal

Write the trigonometric expression in terms of sine and cosine, and then simplify. tan u sin u + cos u _____________.
9. ### Pre-Cal

Write the trigonometric expression in terms of sine and cosine, and then simplify. 1). (csc θ − sin θ)/(cos θ) ____________. 2). Simplify the trigonometric expression. (cos u + 1)/(sin u) + (sin u)/(1 + cos u) …
10. ### pre cal

Use identities to simplify each expression. sin(x)+cos^2(x)/sin(x) = ?

More Similar Questions