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If cos theta=(acosphi+b)/(a+bcosphi)(the...

If `cos theta=(acosphi+b)/(a+bcosphi)(theta,phiacute angle)`show that `tan(theta/2)=sqrt((a-b)/(a+b))tan (phi/2)(a>b)`

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UNITED BOOK HOUSE-ANNUAL EXAMINATION QUESTION PAPERS 2015-EXERCISE
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