6(2c+3d)=5(4c-3d) solve for d
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First, we are going to add 
from both sides of the equation:
Next, we are going to use the trig identity:
to rewrite our expression:
Finally, using our unitary circle, we can infer that
from 0 to 
when 
and 
We can conclude that the solutions of the equation <span>cos (x) tan (x) -1/2=0 over the interval [0,2π] are: </span>
Next, we are going to use the trig identity:
Finally, using our unitary circle, we can infer that
We can conclude that the solutions of the equation <span>cos (x) tan (x) -1/2=0 over the interval [0,2π] are: </span>