Cot A + tan A = sec A × cosec A prove.
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Dot means multiplication
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=cosA/sinA+sinA/cosA
=cosA^2+sinA^2/sinA cosA
=1/sinA cosA
=1/sinA * 1/cos
=Sec A Cosec A
=cosA^2+sinA^2/sinA cosA
=1/sinA cosA
=1/sinA * 1/cos
=Sec A Cosec A
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