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Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 7 - No. 20)

If cos θ = -0.5, and θ is between 0 and 180 degrees, what is the value of θ?
30°
60°
120°
150°

Vysvětlení

cos(120°) = -0.5

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