SOLUTION: I have two questions :). 1. Use a calculator to find the approximate value of cos^-1(0.78). 2. Find the exact value of tan (arcsin (two fifths)). Please explain your reasoning.

Question 1015673: I have two questions :).
1. Use a calculator to find the approximate value of cos^-1(0.78).
2. Find the exact value of tan (arcsin (two fifths)). Please explain your reasoning.

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
In your calculator, press .78.
Hit arc cos button.
.
.
.

So then,

RELATED QUESTIONS
1. Use a calculator to find the approximate value of arcsin(0.72). 2. Find the exact... (answered by ikleyn)

hoe to find the exact value of cos(arcsin(-1/2) +... (answered by stanbon,Alan3354)

use a sketch to find exact value of the expression. cos(tan^-1... (answered by Alan3354)

Find the exact value of the expression. Do not use a calculator. Cos^-1[cos(-5pi/4)].... (answered by stanbon)

Find the exact value of x without using a calculator: tan x=-1,... (answered by stanbon)

use a calculator to approximate two values of theta ( 0 less than or equal to theta less... (answered by stanbon)

find the exact value of... (answered by lwsshak3)

I have to find the exact value for this expression: tan (cos^-1(1/3)) = ???... (answered by Alan3354)

need help use a sketch to find exact value of the expression. cos(tan^-1... (answered by Alan3354)