Home › UP Board Class 10 › Mathematics › Introduction to Trigonometry › The identity $1 + \tan^2\theta$ equals:
The identity $1 + \tan^2\theta$ equals:
A$\cot^2\theta$
B$\csc^2\theta$
C$\sec^2\theta$
D$\cos^2\theta$
Answer & Solution
Correct answer: C. $\sec^2\theta$
Dividing sin²+cos²=1 by cos²θ gives 1 + tan²θ = sec²θ.
Related questions
Ratios are also defined for angles of measure 0 and:If the sides about the right angle are 3k and 4k, the hypotenuse is:tan A can be written as sin A divided by:The identity cosec2 A equals 1 plus:The identity sec2 A minus tan2 A equals:Which identity is proved first in this chain?An equation true for all values of the angle is called an:The value of cosec 30 degrees is: