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    i cant remember how to this simple thing !!

    sin^4x ... but not using reduction ...

    if n e one can help tht would b great
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    sin^4 x = sin^2 x(1 - cos^2 x) = sin^2 x - 1/2*sin^2 (2x)
    Then use cos(2x) = 1 - 2sin^2 x and cos(4x) = 1 - 2sin^2 (2x)
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    (Original post by Bezza)
    sin^4 x = sin^2 x(1 - cos^2 x) = sin^2 x - 1/2*sin^2 (2x)
    Then use cos(2x) = 1 - 2sin^2 x and cos(4x) = 1 - 2sin^2 (2x)
    thanks for the help
 
 
 
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