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Prove that : (2 cos 2^n theta +1)/(2cos ...

Prove that : `(2 cos 2^n theta +1)/(2cos theta +1)= (2cos theta-1)(2cos 2 theta-1) (2cos 2^2 theta-1)............ (2cos 2^(n-1)theta-1)`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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  12. If (tan 3A)/(tan A)=k, show that ( sin 3A)/(sin A)= (2k)/(k-1) and he...

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  13. Prove that : (tan 5 theta+tan3 theta)/(tan 5 theta- tan3 theta)= 4 c...

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  16. Solve : sec theta-cosec theta =4/3.

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