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math b

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if sinx=(4/5), where 0 degrees<x<90 degrees, find the value of cos (x+180)


since x is in the first quadrant, then x+180ยบ is in the third quadrant, and cos(x+180) = =cos x

You should recognize the 3,4,5 right-angled triangle and cosx = 3/5

so cos(x+180)=-3/5


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