If `1/(6!) + 1/(7!) = x/(8!)`, then the value of x is

If x= cos 10^(@)cos 20^(@) cos 40^(@), then the value of x is.............. A) 1/4 tan 10^(@) B) 1/8 cos 10^(@) C) 1/8 cosec 10^(@) D) 1/8 sec 10^(@)

If (x+5) : (x+7) = (x-1): (x+2) , find the value of x.

If the point (1,0),(0,1) and (x,8) are collinear, then the value of x is equal to

If x-2y =-1 , 2x-y = 7 then find the value of x-y .

If f(x) = {((x^6-1/64)/(x^3-1/8),",",x != 1/2),(k,",",x = 1/2):} is continuous at x = 1/2 , then the value of k is

If [(1,2,3),(2,4,1),(3,2,9)][(x),(y),(z)]=[(6),(7),(14)] , then the values of x, y, z respectively are

If A=[(x,-2),(3,7)] and A^(-1)=[(7/34,1/17),((-3)/34,2/17)] ,then the value of x is

If sin x + sin ^(2) x=1, then the value of cos ^(12) x+3 cos ^(10) x+3 cos ^(8) x + cos ^(6) x-2 is equal to ............. A) 0 B) 1 C) -1 D) 2