Issues computing ∫ cos 2 ⁡ x d x without using sin 2...

Ellen Chang

Ellen Chang

Answered

2022-07-02

Issues computing cos 2 x   d x without using sin 2 ( x ) = 1 cos 2 ( x )

Answer & Explanation

Elias Flores

Elias Flores

Expert

2022-07-03Added 24 answers

It means you are going round and round on the answer . You can also use cos ( 2 x ) = 2 cos 2 ( x ) 1 = 1 tan 2 ( x ) 1 + tan 2 ( x ) and then normal substitution of tan ( x ) = t
ttyme411gl

ttyme411gl

Expert

2022-07-04Added 6 answers

Hint:
cos 2 x = 1 2 cos ( 2 x ) + 1 2
= 1 2 cos ( 2 x ) d x + 1 2 1 d x

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