Topics
Trigonometry
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India
Class XI

Evaluate sine, cosine and tangent expressions

Lesson
Practice

Interactive practice questions

Evaluate the following expression, writing your answer correct to 2 decimal places.

$\sin69^\circ$sin69°

Easy
< 1min

Evaluate the following expression. Write your answer correct to one decimal place.

Easy
< 1min

Evaluate the following expression, writing your answer correct to two decimal places.

Easy
1min

Evaluate the following expression using your calculator. Write your answer correct to two decimal places.

Medium
< 1min
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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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