The quadratic formula allows us to find ___
1 answer:
Answer:
Factor.
Step-by-step explanation:
In Mathematics, the quadratic formula is used for determining the two factors (roots) of any quadratic equation.
The standard form of a quadratic equation is ax² + bx + c = 0
Mathematically, the quadratic equation is given by the formula;
Hence, the quadratic formula allows us to find factor solutions to any quadratic equation.
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Answer:
cos(a + b) =
Step-by-step explanation:
cos(a + b) = cos(a).cos(b) - sin(a).sin(b) [Identity]
cos(a) =
cos(b) =
Since, terminal side of angle 'a' lies in quadrant 3, sine of angle 'a' will be negative.
sin(a) = [Since, sin(a) =
]
=
=
Similarly, terminal side of angle 'b' lies in quadrant 2, sine of angle 'b' will be negative.
sin(b) =
=
=
By substituting these values in the identity,
cos(a + b) =
=
=
=
Therefore, cos(a + b) =