sin 600° cos 750° + sin 150° cos 240° = ?

2023

sin 600° cos 750° + sin 150° cos 240° = ?

  1. A.

    2/3

  2. B.

    1

  3. C.

    1/2

  4. D.

    -1

Show answer & explanation

Correct answer: D

Reduce the angles: sin 600 degrees = sin 240 degrees = -sqrt(3)/2 and cos 750 degrees = cos 30 degrees = sqrt(3)/2. Also sin 150 degrees = 1/2 and cos 240 degrees = -1/2. The value is -3/4 - 1/4 = -1.

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