Answer:
the answer is a. 2cos2(x) - 1) 2 -1
Step-by-step explanation:
an easy way to check is to graph every equation and see which ones line up. i did this and a was the right answer :) (edge 2020)
Trigonometric Identities are equalities that utilize trigonometry functions and hold true for all variables in the equation. The correct option is B.
Trigonometric Identities are equalities that utilize trigonometry functions and hold true for all variables in the equation. There are several trigonometric identities relating to the side length and angle of a triangle.
Cos2x is a double angle trigonometric identity because the angle under consideration is a multiple of 2, or the double of x.
Therefore, The expression that is equivalent to cos(4x) is 2cos²(2x) – 1.
Hence, the correct option is B.
Learn more about Trigonometric Identities:
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