Question

-) cos A cos(90° - A) -sin A sin (90°- A) = 0 coc A​

Answer 1

Answer:

1 is the answer

Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

cos A cos ( 90° - A) - sin A sin ( 90° - A )

= cos A sin A - sin A cos A

= sin ( 90° - A )

= cos A