What does $- csc (arccos (7)) + 2 csc (arctan (2))$ $-csc(arccos(7))+2csc(arctan(2))$ equal?

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Answer 1 · 2016-05-14T08:00:23

arc cos 7 is invalid.

If a = arc cos 7, cos a =7 > 1. But $| cos x | \leq 1$ $|cos x|<=1$ .

The expression is invalid.

What does -csc(arccos(7))+2csc(arctan(2))−csc(arccos(7))+2csc(arctan(2))-csc(arccos(7))+2csc(arctan(2)) equal?