9. Let 0 :s; x :s; 7r /2. (a) Use 0 :s; cos x :s; 1 and

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9. Let 0 :s; x :s; 7r /2.

(a) Use 0 :s; cos x :s; 1 and the Comparison Theorem for integrals to prove that o :s; sin x :s; x.

(b) For each nonnegative integer m, set

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