(sin37°+cos75°sin38°)/(cos37°-sin75°sin38°)=?
(sin37°+cos75°sin38°)/(cos37°-sin75°sin38°)=?快快!!写得好给分...
(sin37°+cos75°sin38°)/(cos37°-sin75°sin38°)=?
快快!!写得好给分 展开
快快!!写得好给分 展开
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解答:
(sin37°+cos75°sin38°)/桥友(cos37°-sin75°sin38°)
=[sin(75°-38°)+cos75°sin38°]/[cos(75°-38°)-sin75°sin38°]
=(sin75°cos38°-cos75°sin38°+cos75°sin38°)/(cos75°cos38°+sin75°sin38°-sin75°sin38°)
=sin75°cos38°/(cos75°cos38°)
=tan75°
=tan(45°+30°)
=(tan45°+tan30°)/岩消散(1-tan45°tan30°)
=(1+√3/3)/(1-√3/3)
=(3+√3)/(3-√3)
=(3+√3)²/粗氏6
=(12+6√3)/6
=2+√3
(sin37°+cos75°sin38°)/桥友(cos37°-sin75°sin38°)
=[sin(75°-38°)+cos75°sin38°]/[cos(75°-38°)-sin75°sin38°]
=(sin75°cos38°-cos75°sin38°+cos75°sin38°)/(cos75°cos38°+sin75°sin38°-sin75°sin38°)
=sin75°cos38°/(cos75°cos38°)
=tan75°
=tan(45°+30°)
=(tan45°+tan30°)/岩消散(1-tan45°tan30°)
=(1+√3/3)/(1-√3/3)
=(3+√3)/(3-√3)
=(3+√3)²/粗氏6
=(12+6√3)/6
=2+√3
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