Solved

Convert the Expression $\cos ^ { 4 } b - \sin ^ { 4 } b$

Question 22

Multiple Choice

Convert the expression. $\cos ^ { 4 } b - \sin ^ { 4 } b$

A) 2 cos b
B) cos 2b
C) cos b
D) 2 cos 2b
E) 4 cos b

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