cos(pi/5)
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Use the given information to evaluate each expression.
cos φ = 3/5 with 0 <φ < 90
(a) sin 2φ
(b) cos 2φ
(c) tan 2φ
Match the parametric equations with the correct graph (labeled I-IV).
(a) x = t cos(t), y = t, z = t sin(t), t ≥ 0
(b) x = cos(t), y = sin(t), z = 1/(1+t²)
(c) x = t, y = 1/(1+t²) , z = t²
(d) x = cos(t), y = sin(t), z = cos(2t)
How to graph y = -cos (2x)?