Question

evaluate cot(arccos5/13)

Answer 1

sin^2 + cos^2 = 1

1 + cot^2 = csc^2

cot^2 = csc^2 - 1

Answer 2

ok

Answer 3

or simply draw out the triangle and solve for cot = x/y

Answer 4

what does the arccos mean?

Answer 5

arccos relates a ratio to an angle ... its the reverse, or invers, of cosine

Answer 6

for example:

cos(45) = 1/sqrt(2) therefore 45 = arccos(1/sqrt(2))

Answer 7

so arccos equals the sin

Answer 8

trig (angle) = ratio
angle = arctrig (ratio)

if you know the ratio, you can rebuild the triangle

no, sin and arccos are not equivalent function

Answer 9

but would it be cot(12/13)

Answer 10

you are confusing angles and ratios at the moment