1) (csc-cot)^2=1-cos/1+cos prove that it's an identity
2) show that sin+cos+tan*sin=sec+cos*tan
3) find a numerical value for 1+cos/sin + sin/1+cos =4
1) (csc-cot)^2=1-cos/1+cos prove that it's an identity
2) show that sin+cos+tan*sin=sec+cos*tan
3) find a numerical value for 1+cos/sin + sin/1+cos =4
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