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cotA-tanA=2. the principal value of A is? 45 b. 90 c. 22.5 d.135 cotA-tanA=2. the principal value of A is? 45 b. 90 c. 22.5 d.135
Write, cotA-tanA=2. as:1/tanA – tanA = 2let tanA = t1/t – t = 21 – t^2 = 2tort^2 + 2t – 1 = 0D = 4 + 4 > 0 t = (-2 + 2root2)/2 = -1 + roott2and = -1 – root2
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