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Questions  

If 3sinπx+cosπx=x223x+199, then x is equal to

a
−13
b
13
c
23
d
43

detailed solution

Correct option is B

LHS=3sinπx+cosπx≤2 and RHS = x2−23x+199=x-132+2≥2∴LHS=RHS=2⇒x=13

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