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Prove that (4cos^2 9^0-3)(4cos^2 27^0-3)...

Prove that `(4cos^2 9^0-3)(4cos^2 27^0-3)=tan9^0dot`

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  3. Prove that (4cos^2 9^0-3)(4cos^2 27^0-3)=tan9^0dot

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  11. Show that 4sin27^0=(5+sqrt(5))^(1/2)-(3-sqrt(5))^(1/2)

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  18. Period of f(x)=sin^4x+cos^4x is- pi b. pi/2 c. 2pi d. none of these

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  19. Period of sin^2theta is- pi^2 b. pi/2 c. 2pi d. pi

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