sin210⁰=sin(180⁰+30⁰)=sin30⁰=0.5 или 1/2
tg120⁰=tg(180⁰-60⁰)=tg60⁰=√3
sin(-7π/3)=sin(-420)=-sin(360+60)=-√3/2
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sin210⁰=sin(180⁰+30⁰)=sin30⁰=0.5 или 1/2
tg120⁰=tg(180⁰-60⁰)=tg60⁰=√3
sin(-7π/3)=sin(-420)=-sin(360+60)=-√3/2