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If A,B are acute angle, tan A=5/12 , cos...

If A,B are acute angle, tan A=5/12 , cos B=3/5 , then cos (A+B)=

A

`(16)/(65)`

B

`(65)/(16)`

C

`(65)/(63)`

D

`(56)/(65)`

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-COMPOUND ANGLES-PRACTICE EXERCISE
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  12. If A+B+C=180^(@) " then " sum(cot A + cot B)/(tan A + tan B)=

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  16. In DeltaABC, (CotB + CotC) (CotC + CotA) (CotA + CotB) =

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