if cos(40-x)=sin30 find x
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cos(40-x)=sin30
cos(40-x)=cos(90-30)
40-x=60
-x=60-40
x=-20
check: cos(40-(-20))=sin 30
cos60=sin 30
1/2=1/2
cos(40-x)=cos(90-30)
40-x=60
-x=60-40
x=-20
check: cos(40-(-20))=sin 30
cos60=sin 30
1/2=1/2
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