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If cos A = m cos B, then prove that cot...

If cos A = m cos B, then prove that
`cot frac (A+B)(2)= (m+1)/(m-1) tan ((B-A)/2)`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. If cos A = m cos B, then prove that cot frac (A+B)(2)= (m+1)/(m-1) ta...

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  11. Find thedegree measure corresponding to the following measure. (Use pi...

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