Posted by mien on Wednesday, February 1, 2012 at 7:28am.
in proving trigonometric identities if sec theta  tan theta sin theta is equal to cos theta. what is the correct answer?

trig  Reiny, Wednesday, February 1, 2012 at 11:13am
secØ  tanØsinØ = cosØ
LS (left side)
= 1/cosØ  (sinØ/cosØ)sinØ
= (1  sin^2 Ø)/cosØ
= cos^2 Ø/cosØ
= cosØ
= RS