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sinx — sin x sinxcos x 1 + 2sinxcosx sinx + cosx I — 2cos x sinx — cosx For Exercises 53—56, verify that the equation is an identity. (See Example 7) 54. Inlcott) — Inltantl = 21nlcottl 53. Inlcosfl — Inlcottl = Inlsintl —InlcscÐ — cotOl 56. Inlcsc9 + cot91 = 55. lnSsece tanel —Inlsece — tan61 ................
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