Grade Practice Test | Lumos Learning

Find \(cos{}^{2}(60{}^\circ) + sin{}^{2}(60{}^\circ).\)

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Find \(sin \sigma \) if \(cos \sigma= -1/2\), given that \(180{}^\circ < \sigma < 270{}^\circ.\)

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Find tan x if cos x = 0.5, given \(\frac{3\pi }{2}<x<2\pi .\)

A. \(\frac{\sqrt{3}}{3}\)
B. \(-\sqrt{3}\)
C. \(\sqrt{3}\)
D. \(-\frac{\sqrt{3}}{3}\)

Box 1

Trigonometric Functions (HSF.TF.C.8)