Ответ: sin340°=-sin(360-340)=-sin(20⁰),
cos(-11пи/9)=cos(-π*1 2/9)=cos(-7*π/9)=-cos(2*π/9),
tg(-523°)=tg(-540+17°)=tg(17°),
ctg (18пи/7)=ctg (2*π+4*π/7)=ctg(4*π/7)=ctg(π/2+π/14)=-ctg(π/2-π/14)=-ctg(π/14).
Объяснение:
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Ответ: sin340°=-sin(360-340)=-sin(20⁰),
cos(-11пи/9)=cos(-π*1 2/9)=cos(-7*π/9)=-cos(2*π/9),
tg(-523°)=tg(-540+17°)=tg(17°),
ctg (18пи/7)=ctg (2*π+4*π/7)=ctg(4*π/7)=ctg(π/2+π/14)=-ctg(π/2-π/14)=-ctg(π/14).
Объяснение: