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3x-5x -9-5
-2x -14
x 7
jumlah nilai ke 20 siswa = 62 x 20 = 1240
sehingga nilai siswa terendah = 1260 - 1240 = 20
21) cos²x = a-4
cos x = √a-4
cosec x = 1/ sin a
jika cos x = √a-4
maka r = 1
sin x = √1-(a-4)
= √5-a
sehingga cosec x = 1 / √5-a