涓夎鍑芥暟涓庤В涓夎褰?/p>
鐑偣涓�
瑙ｄ笁瑙掑舰
楂樿�冨瑙ｄ笁瑙掑舰鐨勮�冩煡锛屼互姝ｅ鸡瀹氱悊銆佷綑寮﹀畾鐞嗙殑缁煎悎搴旂敤涓轰富
.
鍏跺懡棰樿寰嬪彲
浠ヤ粠浠ヤ笅涓ゆ柟闈㈢湅锛?/p>
(1)
浠庡唴瀹逛笂鐪嬶紝涓昏鑰冩煡姝ｅ鸡瀹氱悊銆佷綑寮﹀畾鐞嗕互鍙婁笁瑙掑嚱
鏁板叕寮忥紝
涓�鑸槸浠ヤ笁瑙掑舰鎴栧叾浠栧钩闈㈠浘褰负鑳屾櫙锛?/p>
缁撳悎涓夎褰㈢殑杈硅鍏崇郴鑰冩煡瀛?/p>
鐢熷埄鐢ㄤ笁瑙掑嚱鏁板叕寮忓鐞嗛棶棰樼殑鑳藉姏锛?/p>
(2)
浠庡懡棰樿搴︾湅锛屼富瑕佹槸鍦ㄤ笁瑙掓亽绛夊彉
鎹㈢殑鍩虹涓婅瀺鍚堟寮﹀畾鐞嗐�佷綑寮﹀畾鐞嗭紝鍦ㄧ煡璇嗙殑浜ゆ眹澶勫懡棰?/p>
.
銆愪緥
1
銆?/p>
鍦ㄢ柍
ABC
涓紝
a
锛?/p>
b
锛?/p>
c
鍒嗗埆鏄
A
锛?/p>
B
锛?/p>
C
鐨勫杈癸紝涓?/p>
2cos
A
cos
C
(tan
A
tan
C
锛?/p>
1)
锛?/p>
1.
(1)
姹?/p>
B
鐨勫ぇ灏忥紱
(2)
鑻?/p>
a
锛?/p>
c
锛?/p>
3
3
2
锛?/p>
b
锛?/p>
3
锛屾眰鈻?/p>
ABC
鐨勯潰绉?/p>
.
銆愯В鏋愩�?/p>
(1)
鐢?/p>
2cos
A
cos
C
(tan
A
tan
C
锛?/p>
1)
锛?/p>
1
锛?/p>
寰?/p>
2(sin
A
sin
C
锛?/p>
cos
A
cos
C
)
锛?/p>
1
锛屽嵆
cos(
A
锛?/p>
C
)
锛濓紞
1
2
锛?/p>
鈭?/p>
cos
B
锛濓紞
cos(
A
锛?/p>
C
)
锛?/p>
1
2
锛?/p>
鍙?/p>
0<
B
<
蟺
锛屸埓
B
锛?/p>
蟺
3
.
(2)
鐢变綑寮﹀畾鐞嗗緱
cos
B
锛?/p>
a
2
锛?/p>
c
2
锛?/p>
b
2
2
ac
锛?/p>
1
2
锛?/p>
鈭?/p>
锛?/p>
a
锛?/p>
c
锛?/p>
2
锛?/p>
2
ac
锛?/p>
b
2
2
ac
锛?/p>
1
2
锛屽張
a
锛?/p>
c
锛?/p>
3
3
2
锛?/p>
b
锛?/p>
3
锛?/p>
鈭?/p>
27
4
锛?/p>
2
ac
锛?/p>
3
锛?/p>
ac
锛屽嵆
ac
锛?/p>
5
4
锛?/p>
鈭?/p>
S
鈻?/p>
ABC
锛?/p>
1
2
ac
sin
B
锛?/p>
1
2
脳
5
4
脳
3
2
锛?/p>
5
3
16
.
銆?/p>
鍙樺紡
1
銆戣嫢鏈绗?/p>
(2)
闂潯浠跺彉涓衡�滆嫢
b
锛?/p>
3
锛?/p>
S
鈻?/p>
ABC
锛?/p>
3
3
2
鈥?/p>
锛岃瘯姹?/p>
a
锛?/p>
c
鐨勫�?/p>
.
銆愯В鏋愩�?/p>
鐢卞凡鐭?/p>
S
鈻?/p>
ABC
锛?/p>
1
2
ac
sin
B
锛?/p>
3
3
2
锛?/p>
鈭?/p>
1
2
ac
脳
3
2
锛?/p>
3
3
2
锛屽垯
ac
锛?/p>
6.