f′(x)=1+(sinx+cosx)21(cosx−sinx) =1+(sinx+cosx)22cos(x+4π) f(x) is increasing if −2π<x+4π<2π −43π<x<4π hence f(x) is increasing when x∈(−2π,4π).
JEE Main 2007 — Mathematics Calculus
The function f(x)=tan−1(sinx+cosx) is an increasing function in
Held on 30 Apr 2007 · Verified 6 Jul 2026.
(4π,2π)
(−2π,4π)
(0,2π)
(−2π,2π)
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