✨ Best Answer ✨
sin 65° = cos 25°
sin 55° = cos 35°
所以
原式 = sin² 25° + sin² 35° + cos² 35° + cos² 25°
= 1 + 1
= 2
Mathematics
Senior High
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求解
√√5
7. 已知為銳角,且sin+cosA
,求
2
(解)
Hall
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6. 求sin²25°+sin235°+sin255°+sin265°的值。
寅6/1(一)、
114學年月
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