Prove that
(sinA+cosA)(tanA+cotA)=secA+cosecA.
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Answer:
sinA+cosA ) ( sinA/cosA+cosA/sinA)
(sinA+cosA) ( sinA+cosA/cosASinA)
sin squareA+cos squareA/cosA+sinA
1/cosA+sinA
secA+cosecA
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