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Cos (x) = -Sin(x)

1 = -Sin(x) / Cos (x)

1 = -Tan(x)

Tan(x) = -1

x = Tan^-1(-1(

x = -45 degrees = - pi /4 , 3pi/4, 5pi/4 ....

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lenpollock

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1mo ago

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More answers

The derivative of cos(x) equals -sin(x); therefore, the anti-derivative of -sin(x) equals cos(x).

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Wiki User

14y ago
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Q: When does cos x equal -sin x?
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