Eprinxcos
Exrinx cosx = sino + cost.
4 sino cose
4.三
ー、填空題
1. Esin2x
OfBancos 24 ing + Cosio
1- sind cos
sino + cose, cos² x = Sin/cos,
2
of
套れ三角函数的化筒置
tnx cosx=
Cosx
cos
sin
π
2. cos +cos +cos
13
3. Esinx + siny
3π
13
9π
13
==
==
sinxsiny, sin
√x+y
2
x-y
- COS
2
4.2% -77
4.已知
< a <1,2tanß = tan2a, tan(ẞ- a)
tan2a, tan(ẞ-a)=-2√2, cosa
=
2
2
f(4cos
