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The fundamental trigonometric identity is:
A$\sin\theta + \cos\theta = 1$
B$\sin^2\theta + \cos^2\theta = 1$
C$\sin^2\theta - \cos^2\theta = 1$
D$\sin^2\theta + \cos^2\theta = 0$
Answer & Solution
Correct answer: B. $\sin^2\theta + \cos^2\theta = 1$
sin²θ + cos²θ = 1 for all θ.
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: