Question

cos^2 x
simplifi _______ -1 =
1-sinx

Answer 1

Hint: Use an important/common trig identity to write (cos x)^2 in terms of sin x.

Answer 2

Look up "trig identities" and then look for \[\cos ^{2}x\]... You'll likely find the appropriate identity that way.

Answer 3

@elisabet ?

Answer 4

i cant understand

Answer 5

Do you have any kind of reference available? A textbook? Have you done internet searches before? What is your native language?

Answer 6

Please see:

http://www.purplemath.com/modules/idents.htm

Look for the identity that involves (sin x)^2 + (cos x)^2 = 1. Rewrite that so that you have an expression for (cos x)^2.

Answer 7

yes of course... ..I will do it ..thanks a lot

Answer 8

Good luck!