Question

exact value for cos^-1(cos5pi/4)

Answer 1

hint : cos^-1 cos (theta) = theta

Answer 2

\[\cos^-1 ( \cos \Pi + \Pi/4)\]

Answer 3

\[\cos^-1 ( -\cos \Pi/4)\]

Answer 4

= \[-\Pi/4 = -45\]

Answer 5

you have to express co (5 pi/4) in reference angles before applying the rule cos^-1 (cos x) = x

Answer 6

What is the color of Napoleon's white horse?