Problem 3 (Ex. 4.16). Suppose that ƒ : A → B and g : B → C are functions. (a) Prove that if g o f is injective then ƒ is injective. (b) Prove that if g of is surjective then g is surjective.

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Q: · cos(2a) cosh (a)=-1¶ ¶ Solve it to obtain 1 1.875 a and = 4.693 a

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