Verify the identity. tan² (u) - sin²(u) = tan² (u) sin²(u) sin²(u) tan² (u) sin²(u) = = = sin²(u)-( cos² (u) sin²(u) cos² (u) cos² (u) |)(1-cos²(u)) cos² (u) sin²(u) (₁-[ (1 cos² (u) tan²(u) sin²(u)

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