show that sin^2 theta ( 1 + cat^2 theta ) = 1
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sin^2A(1+cot^2A)=1
sin^2A(1/1+cos^2/sin^2A)
sin^2A×sin^2A+cos^2A/sin^2A=1
since sin^2A+cos^2 A=1
sin^2A(1/1+cos^2/sin^2A)
sin^2A×sin^2A+cos^2A/sin^2A=1
since sin^2A+cos^2 A=1
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