cos70∘sin20∘+cos59∘sin31∘−8sin230∘=

1.	cos70∘sin20∘+cos59∘sin31∘−8sin230∘=
Answer» $\frac{c o s 70^{\circ}}{s i n 20^{\circ}} + \frac{c o s 59^{\circ}}{s i n 31^{\circ}} - 8 s i n^{2} 30^{\circ} =$

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