a) \( f(x)=\frac{4}{\cos ^{2} 2 x}-\frac{3}{\sin ^{2}(1-3 x)} \);
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### Step 1: Understand the Function The function given is \( f(x)=\frac{4}{\cos ^{2} 2 x}-\frac{3}{\sin ^{2}(1-3 x)} \). This function is a combination of two fractions, one involving a cosine squared function and the other involving a sine squared function. The Show more…
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