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cos(x-y)=sqrt3/2
cos(pi/6)=sqrt3/2
x-y = pi/6
x=y+pi/6
replace x by y+pi/6 in the other equation given.
cos x/cos y =2
cos (y+pi/6)=2*cos y
(cos y)(cos pi/6)-(sin y)(sin pi/6) = 2*cos y
dividing all by cos y get cos pi/6 - (tan y)*1/2 = 2
sqrt 3/2 - (tan y) *1/2 = 2
tan y = sqrt 3 -4
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