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If cos e cA+secA=cos e c B+s e cB , prov...

If `cos e cA+secA=cos e c B+s e cB ,` prove that: `"tanAtanB"=cot(A+B)/2`

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RD SHARMA ENGLISH-TRANSFORMATION FORMULAE-All Questions
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  3. If cos e cA+secA=cos e c B+s e cB , prove that: "tanAtanB"=cot(A+B)/2

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  5. If cos A+cosB=1/2 and sin A+ sinB=1/4 , prove that: tan((A+B)/2)=1/2

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  7. If sin(y+z-x),sin(z+x-y),"sin"(x+y-z) are in A.P., then t a n x ,tany ...

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