下列命题 ①已知sinθ=1/2,则cosθ=√3/2 ② cosθ=0,下列命题 ①已知sinθ=1/2,则cosθ=√3/2 ② cosθ=0,则sinθ=1 ③已知sinθcosθ=0,则θ=2kπ,k∈Z④已知α=β,则tanα=tanβ其中真命题的个数有?
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![下列命题 ①已知sinθ=1/2,则cosθ=√3/2 ② cosθ=0,下列命题 ①已知sinθ=1/2,则cosθ=√3/2 ② cosθ=0,则sinθ=1 ③已知sinθcosθ=0,则θ=2kπ,k∈Z④已知α=β,则tanα=tanβ其中真命题的个数有?](/uploads/image/z/14760032-32-2.jpg?t=%E4%B8%8B%E5%88%97%E5%91%BD%E9%A2%98+%E2%91%A0%E5%B7%B2%E7%9F%A5sin%CE%B8%3D1%2F2%2C%E5%88%99cos%CE%B8%3D%E2%88%9A3%2F2+%E2%91%A1+cos%CE%B8%3D0%2C%E4%B8%8B%E5%88%97%E5%91%BD%E9%A2%98+%E2%91%A0%E5%B7%B2%E7%9F%A5sin%CE%B8%3D1%2F2%2C%E5%88%99cos%CE%B8%3D%E2%88%9A3%2F2+%E2%91%A1+cos%CE%B8%3D0%2C%E5%88%99sin%CE%B8%3D1+%E2%91%A2%E5%B7%B2%E7%9F%A5sin%CE%B8cos%CE%B8%3D0%2C%E5%88%99%CE%B8%3D2k%CF%80%2Ck%E2%88%88Z%E2%91%A3%E5%B7%B2%E7%9F%A5%CE%B1%3D%CE%B2%2C%E5%88%99tan%CE%B1%3Dtan%CE%B2%E5%85%B6%E4%B8%AD%E7%9C%9F%E5%91%BD%E9%A2%98%E7%9A%84%E4%B8%AA%E6%95%B0%E6%9C%89%3F)
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