TanA/(1+tan²A)² + cotA/(1+cot²)² = sinAcosA
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Step-by-step explanation:
sin a / cos a / ( 1 + sin^2 a/ cos^2 ) + cos a /sin a/ ( 1 + cos^2 /sin^2)
sin a/ cos a/ ( 1/ cos^2 ) + cos a/ sin a/ 1 /sin^2)
sin a/ cos a * cos^3 + cos a/ sin a * sin^3
sin a*cos^2 + cos a* sin^2
sin a*cos a ( sina^2 + cos^2 a )
sin a* cos a
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