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# Trig functions powers Watch

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1. I was wondering why sin^2(x) = (sin(x))^2 ​​but sin^-1(x) ≠ (sin(x))^-1 ?
2. It's really just because of unfortunate notation.

sin-1(x) the way you know it means "the inverse of sine" meaning that if sin(a) = b then sin-1(b) = a.

unfortunately this clashes with when we say sin^2(x) meaning sin(x)^2

To avoid this you can use arcsin, arccos and arctan (short for arcsine, arccosine and arctangent) meaning "the inverse of sine..." etc

To write 1/sinx I would either write just that (1/sinx) or sin(x)^-1 to avoid confusion.

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Updated: October 7, 2016
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