What is cosx xx cos2x?

Mason Cherry

Mason Cherry

Answered question

2023-01-01

What is cosx×cos2x?

Answer & Explanation

heyitsrover017

heyitsrover017

Beginner2023-01-02Added 6 answers

Use trig identity:
cosa.cosb=(12)cos(ab)+(12)cos(a+b)
cosx.cos2x=(12)cos(2xx)+(12)cos(x+2x)
=cosx2+cos3x2

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