cos x = - sin x

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cos x = - sin x

Guest Dec 4, 2016

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The only place where sin and cosine are equal numerically (absolute value) are at 45 135 225 and 315 degrees ...right?

where they are OPPOSITE in value (so cosx= - sinx) are in the 2nd and 4th quadrants 135 and 315 degrees = x

ElectricPavlov · Answer 1 · 2016-12-04T03:51:39

The only place where sin and cosine are equal numerically (absolute value) are at 45 135 225 and 315 degrees ...right?

where they are OPPOSITE in value (so cosx= - sinx) are in the 2nd and 4th quadrants 135 and 315 degrees = x

asinus · Answer 2 · 2016-12-04T05:43:21

cos x = - sin x

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Greeting asinus !