If cos A = 1/2, then what is the positive value of cos 1/2 A, in simplest radical form with a rational denominator?

Step-by-step explanation:

Given

Required

Determine

To do this, we make use of the following identity

Substitute:

Solve the numerator

Rewrite as:

Take square roots

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

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