68. (cosec 0 - sec 0) (cot 0 - tan ) = (cosec 0 + sec 0) (sec 0 cosec 0 - 2)
69. (sec A - cosec A)(1 + tan A + cot A) = tan A sec A - cot A cosec A
cos A cosec A - sin A sec A
70.
= cosec A - sec A
COS A + sin A
COS A
sin A
71. -
sec A + tan A-1 cosec A+ cot A - 1
+
= 1
tan A
72.
cot A
sin A cos A
(1 + tan? A)2 + (1 + cot? A)
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