Question

What is the y-value for f(x) = cos(x) when x = -90°?

Answer 1

what you need to remember is.. cos(-x) = cosx ..
so cos(-90)=cos(90)

Answer 2

so there y value is 90?

Answer 3

can you help with this one too ?What is the y-value for f(x) = tan(90°)?

Answer 4

the question is actually asking you the value of f(x).. and f(x)=cos(-90). which is equal to cos(90).. so your answer would be cos(90).. i hope you know its value.

Answer 5

i don't...

Answer 6

make another post of that question.

Answer 7

umm. cos90=0.. you need to know these sta

Answer 8

standard values*

Answer 9

and.. whenever you find an answer useful, you give the person a medal. :)

Answer 10

okay thanks!

Answer 11

can you help me with my other question?