Question

    If sint + cost = 4/5, then find sint.

    cost.
    A 9/50 Correct Answer Incorrect Answer
    B –9/50 Correct Answer Incorrect Answer
    C 9/25 Correct Answer Incorrect Answer
    D –9/25 Correct Answer Incorrect Answer

    Solution

    sint + cost = 4/5 both sides squaring …. (sint + cost)2 = (4/5)2 sin2t +cos2t +2 ×sint×cost = 16/25 1+2sint ×cost =16/25

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