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Trigonometry

If sin A = 3/5 and cos B = 24/25 and <A and <B are both in quadrant 1, what is the exact value of cos (A-B) ? Help please

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  1. well, you know

    cosA = 4/5
    sinB = 7/25
    cos(A-B) = cosAcosB - sinAsinB

    just plug in the numbers

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  2. oops that's
    cos(A-B) = cosAcosB + sinAsinB

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