Question

If cosx =-1/2,siny = 3/5; where x, y are angles in the second quadrant then cos(x + y).

(a) 1/10(-4+3√3)
(b) 1/10(4-3√3)
(c) -1/10 (4+3√3)
(d) 1/10 (4+3√3)
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Answer 1

Answer:

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