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Mathematics, 02.02.2020 20:00 khambay

Find cos(a+b) given cos a=1/3 with a quadrant i and sin b=-1/2 with b in quadrant

Find cos(a+b) given cos a=1/3 with a quadrant i and sin b=-1/2 with b in quadrant

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Find cos(a+b) given cos a=1/3 with a quadrant i and sin b=-1/2 with b in quadrant
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