pre calc

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use an appropriate half-angle formula to find the exact value ofthe expression.

write the product as a sum

write the sum as a product

  • pre calc -

    sinucosv= 1/2[cos(u-v)-cos(u+v)]

    = 1/2[cos(x-5x)-cos(x+5x)]

    = 1/2[cos(-4x)-cos(6x)]

    = 1/2cos4x-1/2cos6x

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