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COSVI-cos2 73I-a62b2-a2b2a 2a?2ab= R.H.S. (Proved)Х62162 – a²6/6² - a22xхIf tan 18° ==then, show that, cosec 72º - cos 18° =2.уy v x2 + yL.H.S = cosec (90° - 18°) - cos 18°= sec 18° –sec 18°::cos 0 = 1sec 02sec - 18º-12tan- 18°sec2 0 = 1 + tan​

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