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In sinA= 1/sqrt5, cosB= 3/sqrt10, A, B b...

In `sinA= 1/sqrt5, cosB= 3/sqrt10`, A, B being positive acute angles, then what is (A + B) equal to ?

A

`pi//6`

B

`pi//4`

C

`pi//3`

D

`pi//2`.

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