Mathematics
Senior High
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全然わからないので詳しい解説お願いします。
3180° 0 ≦ 90°とする。次の式の値を求めよ。
(1)
sin (90°-0)-cos (90° — €)+sin (180° — €) +cos (180° — €)
*(2) sin (90° + 0) sin (90° — €) — cos (90° + €) cos (90° — €)
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