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Mathematics Test 78

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Mathematics Test 78
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    No. of soln of eqn cos48x – sin49x = 1 is, if x ∈ (–π, π) :-

    Solution

    cos48x – sin49x = 1

    its true only

    cosx = ±1,   sinx = 0

    and

    cosx = 0,     sinx = –1

                No. of soln = 2

     

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