Find the correct value to fill in the space below.
cos 50° = 2 cos^2 ____° -1
2 answers:
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:
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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Hope this helps!
