2018-2019
骞撮珮鑰?/p>
鏁板璇曢鍒嗙被姹囩紪涓夎鍑芥暟
绗?/p>
1
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鍏?/p>
23
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2018-2019
骞撮珮鑰冩暟瀛﹁瘯棰樺垎绫绘眹缂栦笁瑙掑嚱鏁?/p>
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.
1
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锛?/p>
2018
骞撮珮鑰冨叏鍥藉嵎
1
鏂囩
8
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f
锛?/p>
x
锛?/p>
=2cos
2
x
锕?/p>
sin
2
x+2
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A
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f
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x
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f
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x
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蟺锛屾渶澶у�间负
4
C
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f
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x
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D
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f
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x
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4
銆愯В绛斻�?/p>
瑙ｏ細鍑芥暟
f
锛?/p>
x
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=2cos
2
x
锕?/p>
sin
2
x+2
锛?/p>
=2cos
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x
锕?/p>
sin
2
x+2sin
2
x+2cos
2
x
锛?/p>
=4cos
2
x+sin
2
x
锛?/p>
=3cos
2
x+1
锛?/p>
=
锛?/p>
=
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鏁呭嚱鏁扮殑鏈�灏忔鍛ㄦ湡涓?/p>
蟺锛?/p>
鍑芥暟鐨勬渶澶у�间负
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鏁呴�夛細
B
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2
銆?/p>
锛?/p>
2018
骞撮珮鑰冨叏鍥藉嵎
1
鏂囩
11
锛夊凡鐭ヨ
伪
鐨勯《鐐逛负鍧愭爣鍘熺偣锛屽杈逛笌
x
杞寸殑闈炶礋鍗婅酱閲嶅悎锛岀粓杈逛笂鏈?/p>
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1
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a
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B
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2
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b
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锛屼笖
cos2伪=
锛屽垯
|a
锕?/p>
b|=
锛?/p>
锛?/p>
A
锛?/p>
B
锛?
C
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D
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1
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x
杞寸殑闈炶礋鍗婅酱閲嶅悎锛?/p>
缁堣竟涓婃湁涓ょ偣
A
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1
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a
锛?/p>
锛?/p>
B
锛?/p>
2
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b
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锛屼笖
cos2伪=
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鈭碿os2伪=2cos
2
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1=
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cos
2
伪=
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鈭?/p>
|
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|
sin伪
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=
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|
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b|=
=
=
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鏁呴�夛細
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