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21 December, 10:32

If cos3a=sin (a-22°), where 3a & (a-22°) are acute angles find a

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  1. 21 December, 13:42
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    Since they are acute, they lie in first quadrant

    how to check that they are correct?

    Substitute a=28 into the equation

    cos (3*28) = 0.104 ...

    sin (28-22) = 0.104

    hence it is correct
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