What does $2 sin (arccos (2)) - sec (a r c cos (8))$ $2sin(arccos(2))-sec(arc cos(8))$ equal?

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Answer 1 · 2016-02-20T16:49:07

Invalid expression!. .

arc cos is the inverse operator for cos.
(arc cos) (n) is the angle whose cosine is n.
n cannot be outside [ $-$ $-$ 1, 1]. .

What does 2sin(arccos(2))−sec(arccos(8))2sin(arccos(2))-sec(arc cos(8)) equal?