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What is the value of sin 90°?

  1. -1

  2. 0

  3. 1/2

  4. 1

The correct answer is: 1

Sin 90° is equal to the ratio of the side opposite the angle (1) to the hypotenuse (1) in a right triangle. This results in a value of 1, making D the correct answer. A is incorrect because the value of sin 90° cannot be negative. B is incorrect because the value of sin 90° cannot be 0.