# How do you evaluate this trig integral #int 340cos^4(20x) dx#?

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To evaluate the integral ∫340cos^4(20x) dx, you can use the trigonometric identity cos^2(x) = (1 + cos(2x))/2. After substituting this identity, you'll have an integral involving powers of cosine. You can then use power reduction formulas or apply integration by parts to evaluate the integral.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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