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solving trigo equations!Please

:solving trigo equations!Please:Please help me solve the following trigo equations, please show all the steps and the solutions: 1. sin2θ=0 2. sinθ-cosθ=0 3. 2sin^2θ - cos^2θ = 0 4. sin^2θ+2sinθcosθ+cos2θ=0 If any trigo identities are used, please state it. Tha...
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