Mathematics
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⑶0 ⑷−4
次の値を求めよ。
(1) sin 100° sin 80° - cos80° cos 100°
(2)* sin 140˚ sin 50° + cos 140° cos50°
(3) sin 130° + sin 170° - cos80° - cos40°
(4)* (tan 130° + tan 40°)² – (tan50° - tan 140°)²
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