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2016-01-29T17:32:48+05:30
Tan(90-20) .tan 20
--- cot20.tan20
1\tan20.tan20
1
3 5 3
2016-01-30T14:08:07+05:30
Tan(90-70) .tan 70
cot70.tan20
1/tan70.tan20
1
0