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

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

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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) (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

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