use identity
Show:
What I have so far:
(and I'm probably wrong)
then csc x turns to in the denominator...
cancels out one of the sin x...
then in the numerator I know I should use the " " rule somehow... but I can't figure out what to do next.
I appreciate your help!
From these identies, I would choose the second one so that
cos2x + 1 = 2cos^2(x)
Also, the denominator should be 2cos(x) after you cancel out the sines. (the denominator will help in most cases to choose the identity that works best. you still used the first identity on the list correctly, but then it doesn't become as obvious.
EDIT:// what user above said.
,
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since the LHS is difficult, we may start there to prove it.
(1 + cos 2x)/(csc x sin 2x) = cos x,
NUMERATOR: [1 + cos 2x = (2 cos^2 x)]
DENOMENATOR: (csc x)(sin 2x) = (1/sin x)(2 sin x cos x) = 2cos x
can you finish it off?
if you can't still figure out . . . .
ask further.