A. sin - (sin x)
b. tan(tan-1 y)
c. cos(cos -1 z)
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Anyone know? will mark brainliest if correct!

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0