Answer:
b.
Step-by-step explanation:
The given function is

Recall that the reciprocal of the cosine ratio is the secant ratio.
This implies that;



We take the inverse cosine of both sides to obtain;

Hello :
cos60 = cos(-60)=0.5
A^2-b^2=(a+b)(a-b)
1: x^2-4=(x+2)(x-2)
2: (x+8)(x-8)
3: (x+10)(x-10)
4: (x+14)(x-14)
Answer:
Step-by-step explanation:
-1/2