SOLUTION: Given that tan x°=3/7 for which x is an acute angle, find without using using mathematical tables or a calculator, cos(90-x)°

Click here to see ALL problems on Finance

Question 1195235: Given that tan x°=3/7 for which x is an acute angle, find without using using mathematical tables or a calculator, cos(90-x)°
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website!
Given that tan x°=3/7 for which x is an acute angle, find without using using mathematical tables or a calculator, cos(90-x)°
-------------
Make right triangle with sides of y = 3 and x = 7
r = sqrt(3^2 + 7^2) = sqrt(58)
cos(90-x) = sin(x) = y/r = 3/sqrt(58)

Answer by ikleyn(52787) (Show Source):
You can put this solution on YOUR website!
.

Notice that without using tables or a calculator, we can find an exact EXPRESSION for cos(90°-x), ONLY,
but not its value itself.

I am telling it to explain you that the formulation of the problem is incorrect and should be changed.