Question
Minimum value of 5sin2θ+4cos2θ is
Answer: Option D
:
D
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:
D
Let f(θ) = 5sin2θ+4cos2θ = 4+sin2θ
∴ f(θ) ≥ 4 + 0 (∵sin2θ≥0)
∴ The minimum value of f(θ) is 4.
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