Bring everything to one side, convert it all to either sin and cos or tan and cot to simplify.
Give it a shot, if it doesn't work out we'll help further
I understand this is as,Originally Posted by cheerleader4life4u
First you can cancel the sines, to get,
Next, express tangent through sine and cosine,
Add fractions,
Recognize the double-angle identities,
Thus,
Your claim that it is equivalent to
is dreadfully wrong.
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Unless you want me to solve for ?