I need an answer to this asap... please ....just number 3

Mathematics

2 answers:

Agata [3.3K]3 years ago

7 0

Answer:

hence cos ( 2 A ) = cos 2 A − ( 1 − cos 2 A ) = 2 cos 2 A − 1

Step-by-step explanation:Well we know that for two angles A , B

it holds that cos ( A + B ) = cos A cos B − sin A ⋅ sin B hence for A = B you get cos ( 2 A ) = cos 2 A − sin 2 A But sin 2 A = 1 − cos 2 A

SIZIF [17.4K]3 years ago

3 0

Answer:

is writing an answer

Step-by-step explanation:

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