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cos4x=1-8sinx cosx

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cos4x=1-8sinx cosx
  • 1 answers

Harshit Patel 7 years, 5 months ago

Cos4x = 1-2sin^2 2x = 1-2(2sinxcosx)^2 =1-2(4sin^2x cos^2x =1-8 sin^2xcos^2x. ✓✓✓✓
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