In this video I go over another example on trig integrals and solve the integral of sin(x)⁴. I solve this example by applying the half angle trig identities twice to simplify the integral.

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Trigonometric Integrals: Example 4

Example:

Solution:

We could evaluate this integral using the reduction formula I covered in my earlier video:

But a better method is to use the half-angle identity formula: