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[" 15.If "cos^(-1)x+cos^(-1)y=theta," sh...

[" 15.If "cos^(-1)x+cos^(-1)y=theta," show that,"x^(2)-2xy cos theta+y^(2)=sin^(2)theta],[" 16.If "sin(pi cos theta)=cos(pi sin theta)," then show that,"theta=+-(1)/(2)sin^(-1)(3)/(4)]

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