MonotonicityMedium
Question
f (x) = x2 + ax2 + bx2 + bx + 5 sin2 is an increasing function in the set of real numbers if a and b satisfy the condition
Options
A.a2 − 3b − 15
B.a2 − 3b + 15
C.a2 − 3b + 15 < 0
D.a > 0, b > 0
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