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# Points to Remember

An equation involving trigonometric ratios of an angle is called a trigonometric identity if it is true for all values of the angle.

Points to Remember

·        An equation involving trigonometric ratios of an angle is called a trigonometric identity if it is true for all values of the angle.

·        Trigonometric identities

(i) sin 2 θ + cos2 θ = 1

(ii) 1 + tan 2 θ = sec2 θ

(iii) 1 + cot2 θ = cosec2 θ

·        The line of sight is the line drawn from the eye of an observer to the point in the object viewed by the observer.

·        The angle of elevation of an object viewed is the angle formed by the line of sight with the horizontal when it is above the horizontal level.

·        The angle of depression of an object viewed is the angle formed by the line of sight with the horizontal when it is below the horizontal level.

·        The height or length of an object or distance between two distant objects can be determined with the help of trigonometric ratios.

Tags : Trigonometry | Mathematics , 10th Mathematics : Trigonometry
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10th Mathematics : Trigonometry : Points to Remember | Trigonometry | Mathematics

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