SOLUTION: sin(x+y)/cos(x+y) - sinx/cosx how to simplify even sin(x+y) making cos alpha + beta formula

Question 1058012: sin(x+y)/cos(x+y) - sinx/cosx
how to simplify even sin(x+y) making cos alpha + beta formula
Answer by solve_for_x(190) (Show Source): You can put this solution on YOUR website!
Multiply the first term by cos(x)/cos(x), and the second term by cos(x + y)/cos(x + y), which gives:

Expanding sin(x + y) and cos(x + y) then gives:

If you want to go a step farther, the above expression is equivalent to:

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