Question 89

The value of $$\cos $$(1110°) is

Solution

We can write $$\cos $$(1110°) = cos ( 6$$\pi\ $$ + 30)

As cos (6$$\pi\ $$ + x) = +cos x (cos $$\pi\ $$ = 0)

cos ( 6π + 30) = +cos 30 = $$\frac{\sqrt{\ 3}}{2}$$.

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