Choose the statement which is equivalent to sin(x)+cos(x)=0
tan(x)=1
tan(x)=-1
cot(x)=1
tan(x)=0

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.