题目内容
sin80°cos35°-sin10°cos55°=______.
sin80°cos35°-sin10°cos55°
=sin(90°-10°)cos35°-sin10°cos(90°-35°)
=cos10°cos35°-sin10°sin35°
=cos(10°+35°)
=cos45°
=
.
故答案为:
=sin(90°-10°)cos35°-sin10°cos(90°-35°)
=cos10°cos35°-sin10°sin35°
=cos(10°+35°)
=cos45°
=
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故答案为:
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