Trigonometric EquationHard
Question
The function f(x) = tan-1(sinx + cosx) is an increasing function in
Options
A.
B.
C.
D.
Solution
f′(x) = 
(cos x - sin x)
f(x) is increasing if
hence f(x) is increasing when x ∈
(cos x - sin x) f(x) is increasing if
hence f(x) is increasing when x ∈
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