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Class 12 Mathematics Trigonometric Functions Trigonometric functions and their propertiesHardLevel 70

Which is the correct expansion of (\cos 3x)?

Answer and explanation

Correct answer: (4\cos^3 x-3\cos x)

The triple angle formula is (\cos 3x=4\cos^3 x-3\cos x). In exams, do not confuse it with (\sin 3x).

Tags

trigonometric-functionstriple-anglecosine

Frequently asked questions

What is the correct answer to this question?

(4\cos^3 x-3\cos x)

Why is this the correct answer?

The triple angle formula is (\cos 3x=4\cos^3 x-3\cos x). In exams, do not confuse it with (\sin 3x).

Which subject and chapter does this question cover?

This is a Class 12 Mathematics question. Chapter: Trigonometric Functions. Topic: Trigonometric functions and their properties.

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