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a,cosx=0,cosx=1
X1=90°,X2=270°
X3=0°
b,(2sinx+1)²=0
2sinx+1=0,
sinx=--1/2
X1=360-30
=330°
X2=180+30
=210°
c,sinx=1,cosx=-1/5
X1=90°
x2=180-78.46=111.54°
X3=180+78.46=258.46°
d,tanx=0,tanx=-2
X1=0°,X2=180°
X3=180-63.43=116.57°
X4=360-63.43=296.43°
X1=90°,X2=270°
X3=0°
b,(2sinx+1)²=0
2sinx+1=0,
sinx=--1/2
X1=360-30
=330°
X2=180+30
=210°
c,sinx=1,cosx=-1/5
X1=90°
x2=180-78.46=111.54°
X3=180+78.46=258.46°
d,tanx=0,tanx=-2
X1=0°,X2=180°
X3=180-63.43=116.57°
X4=360-63.43=296.43°
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