Please give some very difficult questions of trigonometry to solve
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cos 42°×cos 23°×cos 30°×cos 48°×cos 67°
lekhahasa:
we will feel question tough when we do not concentrate and understand it.
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1.prove that xsin^3theta+ycos^3theta=sin theta.cos theta
2.if 2 sin x/1+cosx+sinx=t
Then find the value of 1-cosx+sinx/1+sinx
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