SOLUTION: the exact value of the expression 3+sin^2 70 + sin ^2 20 is a. 0 b. 1 c. 4 d. 3

Algebra ->  Inequalities -> SOLUTION: the exact value of the expression 3+sin^2 70 + sin ^2 20 is a. 0 b. 1 c. 4 d. 3      Log On


   

Question 972764: the exact value of the expression 3+sin^2 70 + sin ^2 20 is
a. 0
b. 1
c. 4
d. 3
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
the exact value of the expression 3+sin^2 70 + sin ^2 20 is
---------------
sin(20) = cos(70) (you need to know that)
--> 3 + sin^2(70) + cos^2(70)
= 3 + 1
= 4