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Verified answer
Cos1/2a=1/4sin1/a = √15 : 4
Bab Trigonometri
cos (a/2) = 1/4
+- √((1 + cos a)/2) = 1/4
(1 + cos a)/2 = (1/4)²
1 + cos a = 2 . 1/16
cos a = (1/8) - 1
cos a = -7/8 → x/r
y = √(r² - x²)
y = √(8² - (-7)²)
y = √(64 - 49)
y = √15
cosec a = r/y
cosec a = 8/√15
cosec a = (8/15) √15