What is the value of sin^2(1/2 arccos(-5/13)) ?

The value of sin^2(1/2 arccos(-5/13)) is 0.69230…

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sin^2(1/2 arccos(-5/13))

sin^{2} (\frac{1}{2} arccos (- \frac{5}{13}))

0.69230 \dots

Solution steps

sin^{2} (\frac{1}{2} arccos (- \frac{5}{13}))

Refine to a decimal form

= 0.69230 \dots

csc (arcsec (\frac{6}{2}))

\frac{cos ( 14 0 ^{\circ} ) - cos ( 10 0 ^{\circ} )}{sin ( 14 0 ^{\circ} ) - sin ( 10 0 ^{\circ} )}

sin (sin (\frac{π}{2}))

67 sin (5 0^{\circ})

e^{\frac{π}{2}} - e^{a r c t a n (1 + (0)^{2})}

What is the value of sin^2(1/2 arccos(-5/13)) ?
The value of sin^2(1/2 arccos(-5/13)) is 0.69230…