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If SinA = 12/13 And sinB = 4/5, where π/2<A < π And 0 <B < π/2, find the following:
(i) sin(A +B) (ii) cos(A +B)
Given sinA = 12/13 And sinB = 4/5 where π/2 <A < π And 0 <B < π/2
We know that
(i) Sin(A +B)
We know that sin(A +B) = sinA cosB + cosA sinB
(ii) Cos(A +B)
We know that cos(A +B) = cosA cosB - sinA sinB
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