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(^) k Recall that for numbers 0 ≤ k ≤ n the binomial coefficient (^) is defined as n! k! (n−k)! Question 1. (1) Prove the following identity: (22) + (1121) = (n+1). (2) Use the identity above to prove the binomial theorem by induction. That is, prove that for any a, b = R, n (a + b)" = Σ (^) an- n-kyk. k=0 n Recall that Σ0 x is short hand notation for the expression x0+x1+ +xn- (3) Fix x = R, x > 0. Prove Bernoulli's inequality: (1+x)" ≥1+nx, by using the binomial theorem. - Question 2. Prove that ||x| - |y|| ≤ |x − y| for any real numbers x, y. Question 3. Assume (In) nEN is a sequence which is unbounded above. That is, the set {xn|nЄN} is unbounded above. Prove that there are natural numbers N] k for all k Є N. be natural numbers (nk Є N). Prove that

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3) Let G be the group generated by elements a and b satisfying the relations a² = 63, 66 = 1, and a ¹ba = b¹. Which of the following is equivalent to the element z = a a-2ba3b3? A) b-2a-1 B) ab² C) ab D) ba E) b²a

1) Find all complex solutions to cos(z) =

3) Compute where C is the circle |z― i| = - 1 2 2+1 Po z z - 2)2 dz traversed counterclockwise. Solution: TYPE YOUR SOLUTION HERE! INCLUDE A SKETCH OF THE COM- PLEX PLANE AND THE CURVE C. ALSO, MARK ALL SINGULARITIES OF THE INTEGRAND!

2) Consider the function f (z = re²) = e cos(In(r)) + ie¯* sin(ln(r)). Show that is holomorphic at all points except the origin. Also show that =

2) Consider the set SL(n, R) consisting of n x n matrices with real entries having de- terminant equal to 1. Prove that SL(n, R) is a group under the operation of matrix multiplication (it is referred to as the Special Linear Group).

1) What is the parity of the following permutation? (1389) (24) (567)