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Integral of 1/sin^4 x from -pi/4 to pi/4

The same question, asked 2 times: 10 May 2023 S2, 25 Apr 2025 S2. Every wording below, oldest first.

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  1. Question 1

    10 May 2023 S2

    131
    ∫−π/4π/4(sin⁡x)−4 dx\int_{-\pi/4}^{\pi/4}(\sin x)^{-4}\,dx has the value

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  2. Question 2

    25 Apr 2025 S2

    128
    ∫−π4π4sin⁡−4xdx=\int_{\frac{-\pi}{4}}^{\frac{\pi}{4}} \sin^{- 4}xdx=

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