Negative angles and angles beyond 360°

Negative angles and angles beyond 360°

Secondary 4

TGM Original Questions

Without using a calculator, find the exact values of \(\cos750^\circ\) and \(\sin(-120^\circ)\).

Solution:

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Answer:\(\cos750^\circ=\dfrac{\sqrt{3}}{2}\); \(\sin(-120^\circ)=-\dfrac{\sqrt{3}}{2}\).

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