What does $- sin (arccos (2)) - tan (a r c sec (4))$ $-sin(arccos(2))-tan(arcsec(4))$ equal?

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Answer 1 · 2016-05-01T04:59:47

arc cos 2 is invalid.

If a = arc cos 2, cos a = 2 > 1. A cosine value has to be $\in [- 1, + 1]$ $in [-1, +1]$ .

What does −sin(arccos(2))−tan(arcsec(4))-sin(arccos(2))-tan(arcsec(4)) equal?