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cos(sin^-1 (3/5)+ cot^-1(3/2)) = 6/(5sqr...

`cos(sin^-1 (3/5)+ cot^-1(3/2)) = 6/(5sqrt13)`

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Given, `cos(sin^-1 (3/5)+ cot^-1(3/2)) = 6/(5sqrt13)`
=`cos(sin^(−1)(3/5)​)cos(cot^(−1)(3/2)​)−sin(sin^(−1)(3/5)​)sin(cot^(−1)(3/2)​)`
=`sqrt(25-9)/5 xx 3/sqrt(9+4)-3/5 xx 2/sqrt(9+4)`
=`12/(5sqrt(13))-6/(5sqrt(13))`
=`6/(5sqrt(13))`
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