sin600° cos330°+ cos120° sin150°
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Step-by-step explanation:
Sin 600 . cos 330 + cos 120 . sin 150 = 1
sin (1 × 360 + 240) . cos (360 - 30) + cos (180 - 60) . sin (180 - 30) = 1
sin 240 . cos 30 + (-cos 60) . sin 30 = 1
sin (180 + 60) . 1/2√3 - 1/2 . 1/2 = 1
-sin 60 . 1/2√3 - 1/4 = 1
-1/2√3 . 1/2√3 - 1/4 = 1
-3/4 - 1/4 = 1
-4/4 = 1
-1 ≠ 1
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