# Algebra Exercises

**Tutor description**

1. The number of real roots of the equation ecosx - e-cosx 4 = 0 is(A)0(B) 1(C) 2(D) None of these 1. (A) ecosx = t Þ t2 –4t – 1 = 0 Þ t = ecosx = 2 ± Ö5 Since ecosx Î [1/e, e], so number of real roots is 0. 2. The number of real

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