Math, asked by mythl, 7 months ago

1. Sinx (Sin3x + sinx) + COSX (Cos3x - COSX)

Answers

Answered by ERB

0

Answer:

0

Step-by-step explanation:

Sinx (Sin3x + sinx) + COSX (Cos3x - COSX)

= sinxsin3x +sin²x + cosx cos3x - cos²x

= sinxsin3x + cosx cos3x - cos²x +sin²x

= cos(3x-x) - cos 2x

= cos 2x - cox 2x

= 0

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