sin-1=-sin1吗? sin1,sin-1,这是什么意思啊?怎么算啊?
sin1\u7b49\u4e8e\u4ec0\u4e48\uff1f\u600e\u4e48\u7b97\u7684\u8c22\u8c22\u5982\u679c\u6f0f\u5199\u5355\u4f4d\u7b26\u53f7\u00b0\uff0c\u90a3\u4e48\uff1a
sin1\u00b0=0.01745
\u5982\u679c\u786e\u5b9a\u662fsin1\uff0c\u90a3\u5c31\u662fsin1\u5f27\u5ea6\uff0c\u90a3\u4e48\uff1a
sin1=sin57.2958\u00b0=0.84147.
\u6269\u5c55\u8d44\u6599sin1\u4e2d\u76841\u662f\u5f27\u5ea6\u5236\u76841\uff0c1\u5f27\u5ea6\u7b49\u4e8e53\u5ea6\uff0c53\u5ea6\u4e0d\u662f\u7279\u6b8a\u89d2\uff0c\u65e0\u6cd5\u6362\u7b97\uff0c\u6240\u4ee5sin1\u5c31\u7b49\u4e8esin1.\u800carcsin1\u7b49\u4e8e90\u5ea6
\u5728\u76f4\u89d2\u4e09\u89d2\u5f62\u4e2d\uff0c\u2220\u03b1\uff08\u4e0d\u662f\u76f4\u89d2\uff09\u7684\u5bf9\u8fb9\u4e0e\u659c\u8fb9\u7684\u6bd4\u53eb\u505a\u2220\u03b1\u7684\u6b63\u5f26\uff0c\u8bb0\u4f5csin\u03b1\uff0c\u5373sin\u03b1=\u2220\u03b1\u7684\u5bf9\u8fb9/\u2220\u03b1\u7684\u659c\u8fb9 \u3002sin\u03b1\u5728\u62c9\u4e01\u6587\u4e2d\u8ba1\u505asinus\u3002 \u5728\u53e4\u4ee3\u7684\u8bf4\u6cd5\u5f53\u4e2d\uff0c\u6b63\u5f26\u662f\u52fe\u4e0e\u5f26\u7684\u6bd4\u4f8b\u3002 \u53e4\u4ee3\u8bf4\u7684\u201c\u52fe\u4e09\u80a1\u56db\u5f26\u4e94\u201d\u4e2d\u7684\u201c\u5f26\u201d\uff0c\u5c31\u662f\u76f4\u89d2\u4e09\u89d2\u5f62\u4e2d\u7684\u659c\u8fb9\u3002
sin1\u4e2d\u76841\u662f\u5f27\u5ea6\u5236\u76841\uff0c1\u5f27\u5ea6\u7b49\u4e8e57.2958\u00b0\uff0c57.2958\u00b0\u4e0d\u662f\u7279\u6b8a\u89d2\uff0c\u65e0\u6cd5\u6362\u7b97\uff0c\u6240\u4ee5sin1\u5c31\u7b49\u4e8esin1\u3002sin-1\u5c31\u662f\u662fsin\u7684\u53cd\u51fd\u6570\u3002\u7edf\u79f0\u662f\u53cd\u4e09\u89d2\u51fd\u6570\u3002
sin1\u8ba1\u7b97\u65f6\uff0c\u5982\u679c\u6f0f\u5199\u5355\u4f4d\u7b26\u53f7\u00b0\uff0c\u90a3\u4e48
sin1\u00b0=0.01745
\u5982\u679c\u786e\u5b9a\u662fsin1\uff0c\u90a3\u5c31\u662fsin1\u5f27\u5ea6\uff0c\u90a3\u4e48
sin1=sin57.2958\u00b0=0.84147
sin-1\u8ba1\u7b97\u65f6\uff0c\u5982\u679c\u6f0f\u5199\u5355\u4f4d\u7b26\u53f7\u00b0\uff0c\u90a3\u4e48
sin-1\u00b0=-1.570796
\u5982\u679c\u786e\u5b9a\u662fsin-1\uff0c\u90a3\u5c31\u662fsin1\u5f27\u5ea6\uff0c\u90a3\u4e48
sin-1=sin-0.017453=-90\u00b0
\u5728\u76f4\u89d2\u4e09\u89d2\u5f62\u4e2d\uff0c\u2220\u03b1\uff08\u4e0d\u662f\u76f4\u89d2\uff09\u7684\u5bf9\u8fb9\u4e0e\u659c\u8fb9\u7684\u6bd4\u53eb\u505a\u2220\u03b1\u7684\u6b63\u5f26\uff0c\u8bb0\u4f5csin\u03b1\uff0c\u5373sin\u03b1=\u2220\u03b1\u7684\u5bf9\u8fb9/\u2220\u03b1\u7684\u659c\u8fb9 \u3002
\u8fd0\u7528\uff1a\u5728\u76f4\u89d2\u4e09\u89d2\u5f62\u4e2d\uff0c\u2220\u03b1\uff08\u975e\u76f4\u89d2\uff09\uff0csin\u03b1=\u2220\u03b1\u7684\u5bf9\u8fb9/\u2220\u03b1\u7684\u659c\u8fb9\u3002
sin(\u03b1+\u03b2)=sin\u03b1\u00b7cos\u03b2+cos\u03b1\u00b7sin\u03b2
sin(\u03b1-\u03b2)=sin\u03b1\u00b7cos\u03b2-cos\u03b1\u00b7sin\u03b2
sin(2a)=2sina*cosa
\u6269\u5c55\u8d44\u6599\uff1a
\u5b9a\u7406
\u6b63\u5f26\u51fd\u6570\u7684\u5b9a\u7406\uff1a\u5728\u4e00\u4e2a\u4e09\u89d2\u5f62\u4e2d\uff0c\u5404\u8fb9\u548c\u5b83\u6240\u5bf9\u89d2\u7684\u6b63\u5f26\u7684\u6bd4\u76f8\u7b49\uff0c\u5373 a/sin A=b/sin B=c/sin C
\u6b63\u5f26\u51fd\u6570\u7684\u5b9a\u7406\u5728\u4e09\u89d2\u5f62\u6c42\u9762\u79ef\u4e2d\u7684\u8fd0\u7528-
S\u25b3=c2sinAsinB/2sin(A+B)\uff08S\u25b3\u4e3a\u4e09\u89d2\u5f62\u7684\u9762\u79ef\uff0c\u4e09\u4e2a\u89d2\u4e3a\u2220A\u2220B\u2220C\uff0c\u5bf9\u8fb9\u5206\u522b\u4e3aa,b,c\uff0c\uff09
S\u25b3=1/2acsinB=1/2bcsinA=1/2absinC \uff08\u4e09\u4e2a\u89d2\u4e3a\u2220A\u2220B\u2220C\uff0c\u5bf9\u8fb9\u5206\u522b\u4e3aa,b,c\uff0c\u53c2\u89c1\u4e09\u89d2\u51fd\u6570\uff09
\u53e6\u5916\uff0c\u5f53sin\u503c\u5728180~360\u4e4b\u95f4\u4f1a\u51fa\u73b0\u8d1f\u6570\uff0c\u5728360\u4ee5\u4e0a\u5219\u4f1a\u91cd\u590d\u3002
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-sin
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-\u4e09\u89d2\u51fd\u6570
对
sin(-x)=-sin(x)
是的,图像关与原点对称的
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