Monday 1 July 2019
TRIGONOMETRICAL IDENTITIES - PART - 34
67. [(1 + (sec – tan A)
2
] / [cosec A (sec A – tan A]
= 2 tan A
68. [(1 + cosec A – cot)
2
] / [sec A (cosec A – cot A)] = 2 cot A
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