# What is arccos of sin(x)

Arccosine of sine of x.

The arccosine of sine of x is equal to (when k is integer number *k*∈ℤ):

arccos( sin *x* ) = π/2 - arcsin( sin *x* )

= π/2 - (*x*+2*k*π)

= -*x* - 2*k*π + π/2

= -*x* + (0.5-2*k*)π

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