alleryThe 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.
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