Find the value of cos(cos^-1(sqrt2//2)) a. 2 b. sqrt2 c. 2 x sqrt2 d. sqrt2/2

d.

Step-by-step explanation:

1. The first step is calculate the inverse cosine function shown  in the exercise and substract this resul with π/2, as following:

2. Then you have that:

3. Simpliying:

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.

1 x=22.52

2: 65/39=604+39x

65x-39x=604

26x=604

x=604/26

×=23.23