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

Question

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

mathmale · Answer

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

mathmale · Answer

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

mathmale · Answer

@elisabet ?

anonymous · Answer

i cant understand

mathmale · Answer

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

mathmale · Answer

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.

anonymous · Answer

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

mathmale · Answer

Good luck!