SOLUTION: What's the Exact Value for Sin 390 degrees ? Without using a calculator
Algebra.Com
Question 577615: What's the Exact Value for Sin 390 degrees ? Without using a calculator
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
, so .
.
I remember that, but I can also prove it out of a right triangle:
Suppose you have a right triangle ABC, with the right angle at C and a angle at A. That triangle is half of an equilateral triangle.
so
RELATED QUESTIONS
What's the Exact Value for Sin 13π/12 degrees ? Without using a... (answered by josmiceli,KareemM,Alan3354)
What's the Exact Value for Sin 13π/12 degrees ? Without using a calculator
(answered by KMST)
What's the Exact Value for Sin 390 degrees... (answered by jim_thompson5910)
what is the exact value of tan 150 degrees without using a... (answered by stanbon)
exact value of sin 157.5 without using a... (answered by lwsshak3)
find exact value of CSC 210 degrees without using a calculator or the unit... (answered by stanbon)
Find the exact value of the expression without a calculator.
{{{sin^2(40 degrees) +... (answered by greenestamps)
Find the exact value of the following, without using a calculator.
sin(sin^-1... (answered by ikleyn)
Determine the exact value of the expression without using a calculator:
sin(π/12) (answered by greenestamps)