Question

cos 105-cos 15/cos 315=
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Answer 1

$frac{cos105-cos15}{cos315}=frac{cos(180-75)-cos15}{cos(360-45)}=frac{-cos75-cos15}{cos(-45)}\\=frac{-(cos75+cos15)}{cos45}=-frac{2cos45cdot cos30}{cos45}=-2cos30=-2frac{sqrt3}{2}=-sqrt3$

Answer 2

Спасиииииибооооо!!!!!