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If A=B+90 degrees, simplify cosAcosB+sinAsinB. The choices are as follows: A) 0 B) 1 C)cos2B D)cos (2B+90degrees) PS: please show the work on how you

If A=B+90 degrees, simplify cosAcosB+sinAsinB.

The choices are as follows:

A) 0

B) 1

C)cos2B

D)cos (2B+90degrees)

PS: please show the work on how you arrived to theanswer.

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