证明:sin^2x+cos^2x=1
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证明:sin^2x+cos^2x=1证明:sin^2x+cos^2x=1证明:sin^2x+cos^2x=1设A点坐标(x,y),连接AOx^2+y^2=ρ^2依据三角函数的定义:sin^2x+cos
证明:sin^2x+cos^2x=1
证明:sin^2x+cos^2x=1
证明:sin^2x+cos^2x=1
设A点坐标(x,y),连接AO
x^2+y^2=ρ^2
依据三角函数的定义:
sin^2x+cos^2x=(y/ρ)^2+(y/ρ)^2=(x^2+y^2)/ρ^2=ρ^2/ρ^2=1
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