The value of cos(π/5)cos(2π/5)
A) 1/4
B) 1/2
C) 3/4
D) 3/2
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The value of cos(π/5)cos(2π/5)
A) 1/4
B) 1/2
C) 3/4
D) 3/2
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Answer:
cos(π/5).cos(2π/5)=?
Step-by-step explanation:
cos(π/5).
cos(2π/5) = [√(5) - 1 )÷ 4].[√(5) +1 )÷ 4]
=5-1/16
=1/4
Correct option is A