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It supports mathematical functions (including trigonometric functions).
Current location：Mathematical operation > History of Mathematical Computation > Answer
Overview: 1 questions will be solved this time.Among them
☆1 arithmetic calculations
[1/1 Formula]
Work: Calculate the value of equation (4*(cos(2*π/7))^2)*(4*(cos(4*π/7)))^2*(4*(cos(8*π/7))^2) .
Question type: Mathematical calculation
Solution:
(4*(cos(2*π/7))^2)*(4*(cos(4*π/7)))^2*(4*(cos(8*π/7))^2)
=(4*(cos0.897598)^2)*(4*(cos(4*π/7)))^2*(4*(cos(8*π/7))^2)
=(4*0.62349^2)*(4*(cos(4*π/7)))^2*(4*(cos(8*π/7))^2)
=1.554959*(4*(cos(4*π/7)))^2*(4*(cos(8*π/7))^2)
=1.554959*(4*(cos1.795196))^2*(4*(cos(8*π/7))^2)
=1.554959*(4*(-0.222521))^2*(4*(cos(8*π/7))^2)
=1.554959*(-0.890084)^2*(4*(cos(8*π/7))^2)
=1.554959*(-0.890084)^2*(4*(cos3.590392)^2)
=1.554959*(-0.890084)^2*(4*(-0.900969)^2)
=1.554959*(-0.890084)^2*3.246981
=1.554959*0.792249527056*3.246981
=1.231916*3.246981
=4.000008
Answer:(4*(cos(2*π/7))^2)*(4*(cos(4*π/7)))^2*(4*(cos(8*π/7))^2)=4.000008
Note: Radian