Saturday
April 19, 2014

Homework Help: Precalculus

Posted by Kaleen on Saturday, March 10, 2012 at 9:17pm.

Use one of the identities
cos(t + 2πk) = cos t or sin(t + 2πk) = sin t
to evaluate each expression. (Enter your answers in exact form.)
(a)
sin(19π/4)



(b)
sin(−19π/4)



(c)
cos(11π)



(d)
cos(53π/4)



(e)
tan(−3π/4)



(f)
cos(π/4)



(g)
sec(π/6+ 2π)




(h)
csc(2π − 2π/3)

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