The expression cos4xcos3x+sin4xsin3x is equivalent to? a. sin x b. sin7x c. cos x d. cos7x

Try this solution:

cos4xcos3x+sin4xsin3x=cos(4x-3x)=cosx.

C

an

y = 6x -3y -12

y +3y +12 = 6x

=> . x = { 2y / 3 +2 } this is equation of line in terms of x

=> . if line meets the x-axis the co-ordinates of meeting point would be ( x , 0 )

=> . x = 2 ( 0 ) / 3 + 2

=> . x = 2

so, the point is ( 2 , 0 )