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Is. - cosx=cosx

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Is. - cosx=cosx

    • Posted by Gowshiga Pichamuthu 5 years, 9 months ago

    CBSE > Class 11 > Mathematics
    • 2 answers

    Gowshiga Pichamuthu 5 years, 9 months ago

    It is confusing for me. Why because, Sin(-x)= -sinx. Cos(-x)= cosx. But my math sir said . -Cosx is not equal to cosx. I want some clarification.

    0Thank You

    Purvi Bajaj 5 years, 9 months ago

    Yes because -cosx=cos(360-x)=cos x as it will lie in 4th quadrant and in 4th quadrant the value of cos is positive

    0Thank You

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