1/seco-1+1/seco+1=2cosecocto
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Step-by-step explanation:
1/sec-1 + 1/sec+1
=sec+1+sec-1/sec²-1
=2sec/tan²
=2seccot²
=2.1/cos.cos²/sin²
=2.cos/sin²
=2.1/sin.cos/sin
=2coseccot
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