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Ο•ͺ(3)‚Μ1D(6)‚Μ‰π“š
sin3xcos5xdx = 1 2 { sin( 3x+5x ) +sin( 3x5x )}dx = 1 2 { sin8x+sin( 2x ) }dx = 1 2 ( sin8xsin2x )dx = 1 2 { 1 8 ( cos8x ) 1 2 ( cos2x ) }+C = 1 16 cos8x+ 1 4 cos2x+C

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