What is the value of sqrt((1+cos(5/13))/2) ?

The value of sqrt((1+cos(5/13))/2) is 0.98156…

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sqrt((1+cos(5/13))/2)

\frac{1 + cos ( \frac{5}{13} )}{2}

0.98156 \dots

Solution steps

\frac{1 + cos ( \frac{5}{13} )}{2}

Refine to a decimal form

= 0.98156 \dots

sin (\frac{6 π}{7}) cos (\frac{11 π}{21}) - cos (\frac{6 π}{7}) sin (\frac{11 π}{21})

7.05 tan (4 2^{\circ})

sin^{2} (2 3^{\circ}) + sin^{2} (6 7^{\circ})

12 (4)^{5} - 12 sin (4)

sec (arcsin (\frac{40}{41}))

What is the value of sqrt((1+cos(5/13))/2) ?
The value of sqrt((1+cos(5/13))/2) is 0.98156…