Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\sqrt{ 2 } \sin 45- \cos 30 \sin 60+ctg45ctg135-tg0$$

Evaluate

$-\frac{3}{4}=-0.75$

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