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C4 integration question Watch

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    Hi guys,

    Can anyone help me with this question?

    Thanks
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    (Original post by jasminetwine)
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    Hi guys,

    Can anyone help me with this question?

    Thanks
    What have you tried so far?
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    Use the fact that (sint)^2 + (cost)^2 = 1

    Then a few steps later use the fact that sintcost = 0.5sin(2t)

    Finally use the fact that cos4t=1-2(sin(2t))^2
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    What is 9-9(sin(x))^2
    Then what will dx be in terms of x and dt
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    (Original post by jasminetwine)
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    Hi guys,

    Can anyone help me with this question?

    Thanks
    please post your workings after the substitution given
 
 
 
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