# trig

posted by .

simplify and write the trigonometric equation in terms of sine and cosine.

tan^2x-sec^2x

• trig -

You have not provided an equation.

Equations have an "=" sign.

You must have left something out.

Perhaps they just want you to write the term tan^2x-sec^2x in terms of sines and cosines. If so, they should have said so.

• trig -

from the main Pythagorean Identity we know

tan^2 x + 1 = sec^2 x

so tan^2x-sec^2x = tan^2 x - (tan^2 x + 1)
= -1

## Similar Questions

1. ### Trigonometric Expressions

Simplify and write the trigonometric expression in terms of sine and cosine: tanxcscx= 1/f(x) What does f(x)=
2. ### precalculus

Write the trigonometric expression in terms of sine and cosine, and then simplify. cos u + sin u tan u
3. ### math

Simplify and write the trigonometric expression in terms of sine and cosine: sin x + (cot x)(cos x) = (1/f(x)) f(x)= ?
4. ### cosine and sine HELP!

Simplify and write the trigonometric expression in terms of sine and cosine: ((2+tan^2 x)(sec^2 x))-1 = (f(x))^2 f(x)= ?
5. ### sine and cosine

Simplify and write the trigonometric expression in terms of sine and cosine: sin x + (cot x)(cos x) = (1/f(x)) f(x)= ?

Simplify and write the trigonometric expression in terms of sine and cosine: ((2+tan^2 x)(sec^2 x))-1 = (f(x))^2 f(x)= ?
7. ### pre calculus

Simplify and write the trigonometric expression in terms of sine and cosine: ((2+tan^2 x)/(sec^2 x))-1 = (f(x))^2 f(x)= ?
8. ### Math

Simplify and write the trigonometric expression in terms of sine and cosine: ((2+tan^2 x)/(sec^2 x))-1 = (f(x))^2 f(x)= ?
9. ### trig

Simplify and write the trigonometric expression in terms of sine and cosine: cot(-x)cos(-x)+sin(-x)=-1/f(x)=f(x)=____________ I've tried everything, I think that the "-1/f(x)" part is screwing up my answer but I'm not sure what it's …
10. ### Pre-Cal

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

More Similar Questions