If f() = cos and f(a) = 1/4, find the exact value of: (a) f(-a) (b)
Question:
If f(θ) = cos θ and f(a) = 1/4, find the exact value of:
(a) f(-a)
(b) f(a) + f(a + 2π) + f(a – 2π)
Use the periodic and even–odd properties.
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