Example

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

Question

$$)Sin(\frac{-25\pi}{4})$$

Evaluate

$-\frac{\sqrt{2}}{2}\approx -0.707106781$

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