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l-tan'AI tan' AAlf3cotA+ 4, check whether |
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Answer» 3cotA = 4cotA = 4/3So, tanA = 3/4 , sinA = 3/5 , cosA = 4/5L.H.S = (1 – tan2A)/(1 + tan2A) = (1 – 9/16)/(1 + 9/16) = 7/25.R.H.S = cos2A – sin2A = 16/25 – 9/25 = 7/25So, L.H.S = R.H.SYeah , it can be proved directly ,L.H.S = (1 – tan2A)/(1 + tan2A) = cos2AR.H.S = cos2A – sin2A = cos2ASo, L.H.S = R.H.S |
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