Mathematics
Senior High
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*312 次の式の値を求めよ。
(1) sin 10° cos 170°+sin 170° cos 10° (2) cos 10° sin 80°-cos 100° sin 10°
(3) tan 153° tan 63° tan 143° tan 53° (4)
1
tan²50°
1
cos²140°
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