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    Question

    If x sin3 ╬╕ + y cos3 ╬╕ = sin ╬╕

    cos ╬╕ and x sin ╬╕ тИТ y cos ╬╕ = 0, then the value of x2 + y2 equals
    A 1 Correct Answer Incorrect Answer
    B 1/2 Correct Answer Incorrect Answer
    C 3/2 Correct Answer Incorrect Answer
    D 2 Correct Answer Incorrect Answer

    Solution

    x sin3 ╬╕ + y cos3 ╬╕ = sin ╬╕ cos ╬╕┬а -> eq 1 x sin ╬╕ тИТ y cos ╬╕ = 0 x sin ╬╕ = y cos ╬╕ -->eq2 substituting in eq1 y cos ╬╕ sin2 ╬╕ + y cos3 ╬╕ = sin ╬╕ cos ╬╕ taking y cos ╬╕ common y cos ╬╕(sin2 ╬╕ + cos2 ╬╕) = sin ╬╕ cos ╬╕ { we know sin2 ╬╕ + cos2 ╬╕ =1} y cos ╬╕ = sin ╬╕ cos ╬╕ y = sin ╬╕ substituting in eq 2 x sin ╬╕ = sin ╬╕ cos ╬╕ x = cos ╬╕ x2 + y2 sin2 ╬╕ + cos2 ╬╕ = 1

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