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8 sinx cosx(1-2 cos^2 x) if x = 7π /24

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  • Vaman
    Lv 7
    1 month ago

    8 sin x cos x(1-2 cos^2 x) if x = 7π /24

    = 4 sin 2x (1-(1+cos 2x))= -4 sin 2x cos 2x

    = - 2 sin 4x = -2 sin (7pi/6)= -2 sin (pi+pi/6)= 2 sin pi/6

    = 2 sin 30 = 2*1/2=1

    = 4 sin 7pi/12 + 2 sin pi/6

  • Bryce
    Lv 7
    1 month ago

    = 1                                                              

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