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2014-08-04T00:22:44+05:30

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Cos Ф + sin Ф = 0
tan Ф = -1  or cot Ф = -1
tan π/4 = 1    tan 3π/4 = -1 
tan 5π/4 = 1  tan 7π/4  = -1

3π/4  and  7π/4

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