Review the steps of the proof of the identity
sin (A-3pi/2 )= cos A.
sin(A-3pi/2)
Step...
Mathematics, 15.06.2021 21:00 yejinschoi2463
Review the steps of the proof of the identity
sin (A-3pi/2 )= cos A.
sin(A-3pi/2)
Step 1: = sinAcos (3pi/2)-cosAsin(3pi/2)
Step 2: = (sinA)(0) + COSA(-1)
Step 3: = (sinA)(0) + (1) (COSA)
Step 4: = 0 + COSA
Step 5: Cos A
At what step was an error made?
pls help!!
Answers: 3
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