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- prove that sin 1+tan +cos 1+cot sec+cosec
- sin 1+tan +cos 1+cot sec+cosec
- prove that tan+sec-1/tan-sec+1 1+sin/cos
- prove that sin-cos+1/sin+cos-1 sec+tan
- prove that cot+cosec-1/cot-cosec+1 1+cos/sin
- prove that 1+sec-tan/1+sec+tan 1-sin/cos
- prove that sin-cos+1/sin+cos-1 1/sec-tan
- prove that sin/cot+cosec 2+sin/cot-cosec
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