Question
If sin A - cos A = 3/7, then find value of sinA + cos
B, where A is an acute angle.Solution
We Know that, (a+b)2 + (a-b)2 = 2(a2 + b2) Hence, (sin A + cos A)2 + 
= 2(sin2 A + cos2 A) => (sin A + cos A)2Â +Â Â = 2(1) => (sin A + cos A)2Â Â = 2 -Â => (sin A + cos A)2Â Â = 2 - = = => (sin A + cos A)Â =
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