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- cosA + cos3A + cos5A + cos7A + e? cos3e + 2cos5e + cos7e 14. Prove that ; cos2Ð cose + 2cos30 +...
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cosA + cos3A + cos5A + cos7A + e? cos3e + 2cos5e + cos7e 14. Prove that ; cos2Ð cose + 2cos30 + cos5e c s-9Câ9 8.. c J 9 ( 9 Ces (a 9 — S 29 SR 9 c.aao — sin2etan3Ø, 3, tan5Ð
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