Home › UP Board Class 10 › mathematics › Introduction to Trigonometry › The fundamental trigonometric identity is:
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.