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જો alpha=cos^-1(3/5),beta=tan^-1(1/3) જ્...

જો `alpha=cos^-1(3/5),beta=tan^-1(1/3)` જ્યાં `0< alpha , beta < pi/2` તો `alpha-beta =`__________

A

`tan^-1(9/10)`

B

`sin^-1(9/(5sqrt10))`

C

`cos^-1(9/5sqrt10)`

D

`tan^-1(9/14)`

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