if A = 30° and B =60°. find the value of : cos A cos B - sin A sin B
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Hi Mate !!
Cos ( A + B ) = Cos (A ) Cos ( B ) - Sin ( A ) Sin ( B )
A + B = 90
=>. Cos ( 90 ) = 0
Have a nice time.
Cos ( A + B ) = Cos (A ) Cos ( B ) - Sin ( A ) Sin ( B )
A + B = 90
=>. Cos ( 90 ) = 0
Have a nice time.
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