三角函数填空题，求答案
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16 1.3/2 * 5^2 = 16.25
17 cosa = -5/13, tan a = -12/5
18 b/sinB = c/sinC, c = sinC/sinB * b = sqrt(2/3)*2
19 150
20
21 A = 4, w = pi/8, phi = pi/4
17 cosa = -5/13, tan a = -12/5
18 b/sinB = c/sinC, c = sinC/sinB * b = sqrt(2/3)*2
19 150
20
21 A = 4, w = pi/8, phi = pi/4
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