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If cosx+cosy=4/5 & cosx-cosy=2/7 find the value of 14tan(x-y/2)+5cot(x+y/2)

If cosx+cosy=4/5 & cosx-cosy=2/7 find the value of 14tan(x-y/2)+5cot(x+y/2)

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Grade:11

1 Answers

Arun
25750 Points
5 years ago
adding both you get cosx subtracting cosy so we also got sinx and siny if we use half angle formulas we can write sinx in terms of tanx/2 so we got that too so we can solve

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