Trigonometric EquationHard
Question
Let f : (-1, 1) → IR be such that f(cos 4θ) = 
for θ ∈ 
. Then the value(s) of 
is (are)
for θ ∈ . Then the value(s) of is (are) Options
A.
B.
C.
D.
Solution
for θ ∈
Let cos 4θ = 1/3
⇒ cos 2θ =
Let cos 4θ = 1/3
⇒ cos 2θ =
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