Question

(≧ω≦)/

為什麼第2題可以是負的

(1) sin cos
☆☆為一銳角,若sin0+cosd_
sin 0 – cos
Cos
3) sin³ 0 + cos²¹0
(¹) (sino + cosa) = sinte+2 sino cose + cos²0 = =
2 Sino cost
1/1/00
√6
Z
16
2 求下列各式的值:
-H
SinDLOSE ====24
(2) (Sine-cuse) = sin³e - 2 SinE COSE + cos²D = 1 - 2x -= -1 -2 -² = - =
sine - cost = = = = 1²²
by
(Sin 0 + cose) (sin'e - sine cose + cos²B)
-52
Z
12-672
4
2-52
1
Z
'~ a'th²= (a+b)/ a²-abeb²³)
6-13/22
376
191

Answer 1

FuTony

sita角為鈍角，就會是負的