Matematika

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TOLONGIN TRIGONOMETRI!!!!!!!
TOLONGIN TRIGONOMETRI!!!!!!!

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  • sin^2 A . cos^2 A
    = (sin A cos A)^2
    = (1/2 sin 2A)^2
    = 1/4 sin^2 2A
    = 1/4 (1 - cos^2 2A)
    = 2/8 (1 - cos^2 2A)
    = 2/8 - 2/8 cos^2 2A
    = (1/8 + 1/8) - 1/8 . 2 cos^2 2A
    = 1/8 + 1/8 - 1/8 . 2 cos^2 2A
    = 1/8 + 1/8 (1 - 2cos^2 2A)
    = 1/8 + 1/8 . -1(2 cos^2 2A - 1)
    = 1/8 - 1/8 (cos 4A)

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