Question

Asked Oct 20, 2019

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photo attached

Step 1

sinA=15/17 and A is in quadrant II

There cosA will be negative.

CosA= -8/17

Step 2

sinB= -5/13 and B is in quadrant III

There cos is negative too

cosB= -12/13

Step 3

Use the formula sin(A+B)=sinAcosB+cosAsin...

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