Simplify the expression: \[ \sin^2\theta + \cos^2\theta \]

Question: Simplify the expression:

$${\sin }^2\theta +{\cos }^2\theta$$

Answer: 

1

Additional Information :

We use the fundamental Pythagorean identity in trigonometry:

$$\sin^2\theta + \cos^2\theta = 1$$

Since the given expression is:

$$\sin^2\theta + \cos^2\theta$$

we directly substitute the identity:

$$\sin^2\theta + \cos^2\theta = 1$$

Final Answer:

$$\boxed{{\displaystyle 1}}$$

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