Alejandro W.

asked • 03/22/18

trig exercise of sums and differences identities

If cosα=0.173 and cosβ= 0.432 with both angles’ terminal rays in Quadrant-I, find the values of cos(α+β)=?
cos(α-β)=?
Your answers should be accurate to 4 decimal places.

please help! thanks !

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