Math, asked by gsadhana688, 8 months ago

express cos5A in terms of cosA

Answers

Answered by sivasanjana

6

Step-by-step explanation:

Use the compound angle formulae. Then the double and triple angle formulae.

cos(2a + 3a) = cos(2a)cos(3a) - sin(2a)sin(3a)

= (2cos^2(a) - 1)(4cos^3(a) -3cos(a)) -

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