Example

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

Question

$$\frac{2\ \cos\ 90^{\circ}-35in\ 60^{\circ}-\tan^{2}45}{1+\cos^{4}90^{\circ}-9+on^{2}y5^{\circ}}$$

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