Question

If sin x = .42, what is cos x?

Answer 1

??

Answer 2

well draw a triangle

0.42 = 42/100



find b using pythagoras then frind the cos(x)

Answer 3

or compute
\[\large \pm\sqrt{1-.42^2}\]

Answer 4

I dont understand @campbell_st

Answer 5

well do you know pythagoras' theorem...

c^2 = a^2 + b^2

it can be used the find the measure of b

this is because you are given the value of sin(x)... which is opposite/hypotenuse

so you have the measures for the hypotenuse and opposite side. You just
need to find the adjacent side before find cos(x)

b^2 = 100^2 - 42^2

so find b

then cos(x) = b/100

Answer 6

If tan x = .76 and cos x = .22, what is sin x? @campbell_st

Answer 7

well you know that

hope it helps

Answer 8

Thanks, but how would you do this one If cos x = .75, what is sin x? @campbell_st