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1．形如y=asinθ±bcosθ(a,b∈R+) 其中φ=arctanb/a．当θ±φ=π/2时, 当θ±φ=3π/2时,
1. The shape is y=asinθ±bcosθ(a,b∈R+) where φ=arctanb/a. When θ±φ=π/2, when θ±φ=3π/2,