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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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!!

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Other questions on the subject: Mathematics

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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!!