Use a Double-Angle Formula to Rewrite the Expression

question 37

Multiple Choice

Use a double-angle formula to rewrite the expression. ​
2 sin² x - 1
​

• A)cos x
• B)cos 2x ​
• C)-2 cos x ​
• D)2 cos 2x ​
• E)- cos 2x ​

---

Definitions:

Scala Tympani

A fluid-filled spiral passage in the inner ear, part of the cochlea, involved in converting sound vibrations into neural signals.

Basilar Membrane

A key structural element within the cochlea of the inner ear, it plays a critical role in the process of hearing by converting sound vibrations into neural signals.

Spiral Organ

A structure located in the cochlea of the inner ear responsible for converting sound vibrations into electrical signals.

Semicircular Ducts

Fluid-filled passages in the inner ear that are sensitive to rotational movements of the head, aiding in the sense of balance.