What does $-cos(arctan(6))-2csc(arccos(5))$ equal?

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Answer 1 · 2016-07-20T09:48:47

arc cos 5 is an invalid arc cosine.

arc cos 5 in the expression is the angle whose cosine is 5.

For any a. $-1 <= cos a <= 1$ .

So, there is no a for which $cos a = 5 > 1.$

What does -cos(arctan(6))-2csc(arccos(5))-cos(arctan(6))-2csc(arccos(5)) equal?