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8 June, 22:52

The angle t is acute and sin t = 6/7 is given use a Pythagorean identity to find cos t

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  1. 8 June, 23:13
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    sqrt (1 - 36/49) = + root (13) / 7

    Step-by-step explanation:

    sin^2t + cos^2t is identical to 1 for all t.

    (6/7) ^2 + cos^2t = 1

    1 - 36/49 = cos^2t

    hence plus/miuns sqrt (1 - 36/49) = cos (t)

    since t is acute, the answer must be positive.
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