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" If "tan(theta)/(2)=sqrt((a-b)/(a+b))ta...

" If "tan(theta)/(2)=sqrt((a-b)/(a+b))tan(phi)/(2)," prove that "cos theta=(a cos phi+b)/(a+b cos phi)

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If tan[(theta)/(2)]=sqrt((1-e)/(1+e))tan[(phi)/(2)] then prove that cos phi=(cos theta-e)/(1-e cos theta)

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