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If cos^(3) theta = kcos (alpha- 3 theta)...

If `cos^(3) theta = kcos (alpha- 3 theta) and sin ^(3) theta= ksin (alpha-3 theta)`, then show that `2k^(2)-k cos alpha-1=0`

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  13. Solve : ("sin" (x)/(2) "cos" (x)/(2))/(1-8 "sin"^(2)(x)/(2) "cos"^(2...

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