Mathematics, 09.04.2020 00:35 jaymoney0531

Help me.

How to prove that:

1) 2cosa-cos3a-cos5a=16cos3a. sin2a

2) sina(cos2a+cos4a+cos6a)=cos4a. sin3a

Answers: 3

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How to prove that:

1) 2cosa-cos3a-cos5a=16cos3a. sin2a

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Help me. How to prove that: 1) 2cosa-cos3a-cos5a=16cos3a. sin2a 2) sina(cos2a+cos4a+cos6a)=cos4a. sin3a

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Another question on Mathematics

Help me.

How to prove that:

1) 2cosa-cos3a-cos5a=16cos3a. sin2a

2) sina(cos2a+cos4a+cos6a)=cos4a. sin3a