Sin⁴∅ + Cos⁴∅ equals to
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Sin⁴∅ - cos⁴∅ = 1 (sin²∅ - cos²∅ )( sin²∅+ cos²∅ ) = 1. we know that , sin²∅ + cos²∅ = 1. so, (sin²∅ - cos²∅).1 = 1 form above eqn. sin²∅ - cos²∅ = 1. sin²∅ -(1-sin²∅ ) = 1. 2sin²∅ = 2. sin²∅ = 1. so, 1/cosec²∅ = 1. cosec² ∅ = 1. here some typing mistake. I think questions is. sin⁴∅ - cos⁴∅ = 1.
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