Prove that : (1) cosa/1-tana +sina/1-cota = sina + cosa
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Step-by-step explanation:
cosA/1-tanA + sinA/1-cotA
cosA/1-tanA - sinA/cotA-1
cosA/1-(sinA/cosA) - sinA/(cosA/sinA)-1
cos²A/(cosA-sinA) - sin²A/(cosA-sinA)
(cos²A-sin²A)/(cosA-sinA)
cosA+sinA
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