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    Question

    If sin A - cos A = 3/7, then find value of sinA + cos

    B,┬а where A is an acute angle.
    A тИЪ94/5 Correct Answer Incorrect Answer
    B 1 Correct Answer Incorrect Answer
    C тИЪ89/7 Correct Answer Incorrect Answer
    D 9/16 Correct Answer Incorrect Answer

    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)2┬а+┬а ┬а= 2(1) => (sin A + cos A)2┬а┬а= 2 -┬а => (sin A + cos A)2┬а┬а= 2 - = = => (sin A + cos A)┬а=

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