right-angled A triangle has two acute angles, A and B. Show that the triangle is right-angled if, and only if, (sinA)^2 + (sinB )^2=sin(A + B).
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Originally Posted by perash right-angled A triangle has two acute angles, A and B. Show that the triangle is right-angled if, and only if, (sinA)^2 + (sinB )^2=sin(A + B). This may help
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