三角函数值的表？ 三角函数值表
\u4e09\u89d2\u51fd\u6570\u503c\u8868\uff0c\u8981\u8868\u554a\uff081\uff09\u7279\u6b8a\u89d2\u4e09\u89d2\u51fd\u6570\u503c
sin0=0
sin30=0.5
sin45=0.7071 \u4e8c\u5206\u4e4b\u6839\u53f72
sin60=0.8660 \u4e8c\u5206\u4e4b\u6839\u53f73
sin90=1
cos0=1
cos30=0.866025404 \u4e8c\u5206\u4e4b\u6839\u53f73
cos45=0.707106781 \u4e8c\u5206\u4e4b\u6839\u53f72
cos60=0.5
cos90=0
tan0=0
tan30=0.577350269 \u4e09\u5206\u4e4b\u6839\u53f73
tan45=1
tan60=1.732050808 \u6839\u53f73
tan90=\u65e0
cot0=\u65e0
cot30=1.732050808 \u6839\u53f73
cot45=1
cot60=0.577350269 \u4e09\u5206\u4e4b\u6839\u53f73
cot90=0
\u79cb\u98ce\u71d5\u71d5\u4e3a\u60a8\u7b54\u9898 O(\u2229_\u2229)O
\u6709\u4ec0\u4e48\u4e0d\u660e\u767d\u53ef\u4ee5\u5bf9\u8be5\u9898\u7ee7\u7eed\u8ffd\u95ee
\u5982\u679c\u6ee1\u610f\uff0c\u8bf7\u53ca\u65f6\u9009\u4e3a\u6ee1\u610f\u7b54\u6848\uff0c\u8c22\u8c22
\u4e09\u89d2\u51fd\u6570\u503c\u5982\u4e0b\uff1a
\u4e09\u89d2\u51fd\u6570\u662f\u6570\u5b66\u4e2d\u5c5e\u4e8e\u521d\u7b49\u51fd\u6570\u4e2d\u7684\u8d85\u8d8a\u51fd\u6570\u7684\u4e00\u7c7b\u51fd\u6570\u3002\u5b83\u4eec\u7684\u672c\u8d28\u662f\u4efb\u610f\u89d2\u7684\u96c6\u5408\u4e0e\u4e00\u4e2a\u6bd4\u503c\u7684\u96c6\u5408\u7684\u53d8\u91cf\u4e4b\u95f4\u7684\u6620\u5c04\u3002
\u901a\u5e38\u7684\u4e09\u89d2\u51fd\u6570\u662f\u5728\u5e73\u9762\u76f4\u89d2\u5750\u6807\u7cfb\u4e2d\u5b9a\u4e49\u7684\uff0c\u5176\u5b9a\u4e49\u57df\u4e3a\u6574\u4e2a\u5b9e\u6570\u57df\u3002\u53e6\u4e00\u79cd\u5b9a\u4e49\u662f\u5728\u76f4\u89d2\u4e09\u89d2\u5f62\u4e2d\uff0c\u4f46\u5e76\u4e0d\u5b8c\u5168\u3002
\u6269\u5c55\u8d44\u6599
\u5404\u4e2a\u51fd\u6570\u53d8\u5316\uff1a\u6570\u5173\u7cfb\uff1atan\u03b1 \u00b7cot\u03b1=1\uff0csin\u03b1 \u00b7csc\u03b1=1\uff0ccos\u03b1 \u00b7sec\u03b1=1
\u5546\u7684\u5173\u7cfb\uff1atan\u03b1=sin\u03b1/cos\u03b1 cot\u03b1=cos\u03b1/sin\u03b1
\u79ef\u5316\u5408\u5dee\u516c\u5f0f\uff1asin\u03b1 \u00b7cos\u03b2=\uff081/2\uff09*[sin\uff08\u03b1+\u03b2\uff09+sin\uff08\u03b1\uff0d\u03b2\uff09]\uff1bcos\u03b1 \u00b7sin\u03b2=\uff081/2\uff09*[sin\uff08\u03b1+\u03b2\uff09\uff0dsin\uff08\u03b1\uff0d\u03b2\uff09]
cos\u03b1 \u00b7cos\u03b2=\uff081/2\uff09*[cos\uff08\u03b1+\u03b2\uff09+cos\uff08\u03b1\uff0d\u03b2\uff09]\uff1bsin\u03b1 \u00b7sin\u03b2=-\uff081/2\uff09*[cos\uff08\u03b1+\u03b2\uff09\uff0dcos\uff08\u03b1\uff0d\u03b2\uff09]
\u548c\u5dee\u5316\u79ef\u516c\u5f0f\uff1asin\u03b1+sin\u03b2=2sin[(\u03b1+\u03b2)/2]\u00b7cos[(\u03b1-\u03b2)/2]\uff1bsin\u03b1-sin\u03b2=2cos[(\u03b1+\u03b2)/2]\u00b7sin[(\u03b1-\u03b2)/2]
cos\u03b1+cos\u03b2=2cos[(\u03b1+\u03b2)/2]\u00b7cos[(\u03b1-\u03b2)/2]\uff1bcos\u03b1-cos\u03b2=-2sin[(\u03b1+\u03b2)/2]\u00b7sin[(\u03b1-\u03b2)/2]
\u53c2\u8003\u8d44\u6599 \u767e\u5ea6\u767e\u79d1\u2014\u2014\u4e09\u89d2\u51fd\u6570\u503c
A弧度 0 π/6 π/4 π/3 π/2 2π/3 3π/4 5π/6 π 3π/2
sinA 0 1/2 √2/2 √3/2 1 √3/2 √2/2 1/2 0 -1
cosA 1 √3/2 √2/2 1/2 0 -1/2 -√2/2 -√3/2 -1 0
tanA 0 √3/3 1 √3 None -√3 -1 -√3/3 0 None
cotA None √3 1 √3/3 0 -√3/3 -1 -√3 None 0
A 15° 75°
A弧度 π/12 5π/12
sinA (√6-√2)/4 (√6+√2)/4
cosA (√6+√2)/4 (√6-√2)/4
tanA 2-√3 2+√3
cotA 2+√3 2-√3
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绛旓細(1)鐗规畩瑙涓夎鍑芥暟鍊 sin0=0 sin30=0.5 sin45=0.7071 浜屽垎涔嬫牴鍙2 sin60=0.8660 浜屽垎涔嬫牴鍙3 sin90=1 cos0=1 cos30=0.866025404 浜屽垎涔嬫牴鍙3 cos45=0.707106781 浜屽垎涔嬫牴鍙2 cos60=0.5 cos90=0 tan0=0 tan30=0.577350269 涓夊垎涔嬫牴鍙3 tan45=1 tan60=1.732050808 鏍瑰彿3 tan90=鏃 cot0=鏃 cot30...
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绛旓細甯哥敤涓夎鍑芥暟鍊瀵圭収琛 sin0=sin0掳=0 cos0=cos0掳=1 tan0=tan0掳=0sin15=0.650锛泂in15掳=0.259 cos15=-0.759锛沜os15掳=0.966 tan15=-0.855锛泃an15掳=0.268 sin30掳=1/2 cos30掳=0.866锛泃an30掳=0.577锛泂in45掳=0.707锛沜os45掳=0.707 tan45=1.620锛泃an45掳=1 sin...
