Question

If cos x = -4/5 and sin y = 5/13, and both lie in the Second quadrant,
find the value of :
i) sin x/2
ii) cos y/2
iii) cos(x+y)

Answer 1

Answer:

If cos x = -4/5 and sin y = 5/13,

cos y/2

Answer 2

Answer:

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