sin(-420°)=

cos(-750°)=

tg(-405°)=

2cos60°-tg π/4=

ctg45°-2sin π/6=

2cos30°·ctg60°-sin 3π/2=

ctg405°-ctg(-405°)÷2sin(-750°)=

\[\sin(-420^\circ)=-\frac{\sqrt3}{2}\]

\[\cos(-750^\circ)=\frac{\sqrt3}{2}\]

\[\tan(-405^\circ)=-1\]

\[2\cos60^\circ-\tan\frac{\pi}{4}=0\]

\[\cot45^\circ-2\sin\frac{\pi}{6}=0\]

\[2\cos30^\circ\cdot\cot60^\circ-\sin\frac{3\pi}{2}=2\]

\[\cot405^\circ-\cot(-405^\circ)\div2\sin(-750^\circ)=0\]

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