楂樹腑鏁板
绗竴绔?/p>
涓夎鍑芥暟缁煎悎妫�娴嬮
鏈瘯鍗峰垎绗厾鍗?/p>
(
閫夋嫨棰?/p>
)
鍜岀鈪″嵎
(
闈為�夋嫨棰?/p>
)
涓ら儴鍒嗐�?/p>
婊″垎
150
鍒嗐�傝�冭瘯鏃堕棿
120
鍒嗛挓銆?/p>
绗厾鍗?/p>
(
閫夋嫨棰?/p>
鍏?/p>
60
鍒?/p>
)
涓�銆侀�夋嫨棰?/p>
(
鏈ぇ棰樺叡
12
涓皬棰橈紝姣忓皬棰?/p>
5
鍒嗭紝鍏?/p>
60
鍒嗭紝鍦ㄦ瘡灏忛缁欏嚭鐨勫洓涓�夐」涓?/p>
鍙湁涓�涓槸绗﹀悎棰樼洰瑕佹眰鐨?/p>
)
1
锛庤嫢
伪
鏄浜岃薄闄愯锛屽垯
180掳锛?/p>
伪
鏄?/p>
(
)
A
锛庣涓�璞￠檺瑙?/p>
B
锛庣浜岃薄闄愯
C
锛庣涓夎薄闄愯
D
锛庣鍥涜薄闄愯
[
绛旀
]
A
[
瑙ｆ瀽
]
伪
涓虹浜岃薄闄愯锛屼笉濡ㄥ彇
伪
锛?20掳锛屽垯
180掳锛?/p>
伪
涓虹涓�璞￠檺瑙掞紟
2
锛庡凡鐭?/p>
2
寮у害鐨勫渾蹇冭鎵�瀵圭殑寮﹂暱涓?/p>
2
锛屽垯杩欎釜鍦嗗績瑙掓墍瀵圭殑寮ч暱鏄?/p>
(
)
A
锛?/p>
2
B
锛?/p>
sin2
C.
2
sin1
D
锛?/p>
2sin1
[
绛旀
]
C
[
瑙ｆ瀽
]
鐢遍璁撅紝鍦嗗姬鐨勫崐寰?/p>
r
锛?
1
sin1
锛屸埓鍦嗗績瑙掓墍瀵圭殑寮ч暱
l
锛?/p>
2
r
锛?/p>
2
sin1
.
3
锛庡鍥撅紝鍦ㄧ洿瑙掑潗鏍囩郴
xOy
涓紝灏勭嚎
OP
浜ゅ崟浣嶅渾
O
浜庣偣
P
锛岃嫢鈭?/p>
AOP
锛?/p>
胃
锛屽垯鐐?/p>
P
鐨?/p>
鍧愭爣鏄?/p>
(
)
A
锛?/p>
(cos
胃
锛?/p>
sin
胃
)
B
锛?/p>
(
锛?/p>
cos
胃
锛?/p>
sin
胃
)
C
锛?/p>
(sin
胃
锛?/p>
cos
胃
)
D
锛?/p>
(
锛?/p>
sin
胃
锛?/p>
cos
胃
)
[
绛旀
]
A
[
瑙ｆ瀽
]
璁?/p>
P
(
x
锛?/p>
y
)
锛岀敱涓夎鍑芥暟瀹氫箟鐭?/p>
sin
胃
锛?/p>
y
锛?/p>
cos
胃
锛?/p>
x
锛屾晠
P
鐐瑰潗鏍囦负
(cos
胃
锛?/p>
sin
胃
)
锛?/p>
4
锛庤
伪
鏄浜岃薄闄愯锛?/p>
P
(
x,
4)
涓哄叾缁堣竟涓婄殑涓�鐐癸紝涓?/p>
cos
伪
锛?/p>
1
5
x
锛屽垯
tan
伪
锛?/p>
(
)
A.
4
3
B
锛?/p>
3
4
C
锛庯紞
3
4
D
锛庯紞
4
3
[
绛旀
]
D