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The value of cos e cpi/(18)-4sin((7pi)/(...

The value of `cos e cpi/(18)-4sin((7pi)/(18))` is

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  4. If A+B+C=(3pi)/2, then cos2A +cos2B+cos2C is

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  5. Prove that: (costheta)/(1+sintheta)=tan(pi/4-theta/2)

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  13. Prove that: (cos2theta)/(1+sin2theta)=tan(pi/4-theta)

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  14. If sin(x+20^0)=2sinxcos40^0,where in (0,pi/2), then which of the follo...

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