Cos 20° - cos 70° / sin 70° - sin 20° adalah ...
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Kelas 10 MatematikaBab Trigonometri
(cos 20° - cos 70°)/(sin 70° - sin 20°)
= (-2 sin ((20° + 70°)/2) . sin ((20° - 70°)/2)) / (2 . cos ((70° + 20°)/2) . sin ((70° - 20°)/2))
= (-2 . sin 45° . sin (-50°)) / (2 . cos 45° . sin 50°)
= ( 1/2 √2)/( 1/2 √2)
= 1