fairyxx fairyxx

05-05-2019
Mathematics

contestada

Find the correct value to fill in the space below.

cos 50° = 2 cos^2 ____° -1

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Аноним Аноним

05-05-2019

Answer:

25.

Step-by-step explanation:

Use the identity cos 2x = 2 cos^2 x - 1

So cos 50 = 2 cos^2 25 - 1

So the space = 25.

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jimrgrant1 jimrgrant1

05-05-2019

Answer:

25°

Step-by-step explanation:

Using the double angle trigonometric identity for cosine

• cos2x = 2cos²x - 1

Here 2x = 50° ⇒ x = 25°, thus

cos50° = 2cos²25° - 1

Answer Link

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