Range of function \( f(x)=\cos ^{2} x+4 \sec ^{2} x \) is(A) \( [4, \infty) \)(B) \( [0, \infty)...

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Range of function \( f(x)=\cos ^{2} x+4 \sec ^{2} x \) is(A) \( [4, \infty) \)(B) \( [0, \infty) \)(C) \( [5, \infty) \)(D) \( (0, \infty) \)\( \mathrm{P} \)W
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