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## Question

secondary 3 | A Maths

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sin 300 deg

= sin (360-60) deg

= -sin 60 deg

= -√3/2

(b)

tan (-210 deg)

= tan (360 -210) deg

= tan 150 deg

= tan (180-30) deg

= -tan 30 deg

= -1/√3

(c)

cos(-π/3)

= cos π/3

= 0.5

(d)

tan 2π/3

= tan (π - 2π/3)

= -tan π/3

= -√3

...

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