1
WB JEE 2017
MCQ (Single Correct Answer)
+2
-0.5
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The value of K in order that f(x) = sin x $$-$$ cos x $$-$$ kx + 5 decreases for all positive real values of x is given by
A
K < 1
B
K $$ \ge $$ 1
C
K > $$\sqrt 2$$
D
K < $$\sqrt 2$$
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