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India
Class XI

Apply sum and difference and double angle identities

Interactive practice questions

Write $\sin3x$sin3x in terms of $\sin x$sinx.

Leave your answer in expanded form.

Easy
3min

Write $\cos3x$cos3x in terms of $\cos x$cosx.

Easy
4min
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Outcomes

11.SF.TF.1

Positive and negative angles. Measuring angles in radians and in degrees and conversion from one measure to another. Definition of trigonometric functions with the help of unit circle. Truth of the identity sin^2 x + cos^2 x = 1, for all x. Signs of trigonometric functions and sketch of their graphs. Expressing sin (x + y) and cos (x + y) in terms of sin x, sin y, cos x and cos y. Deducing the identities like following: cot(x + or - y), sin x + sin y, cos x + cos y, sin x - sin y, cos x - cos y (see syllabus document)

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