在三角形abc中+b=2asinB+则B+C等于多少?
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b = 2asinB
sinB = 2sinAsinB
sinA = 1/2
A = π/6 或 A = 5π/6
B + C = 5π/6 或 B + C = π/6
sinB = 2sinAsinB
sinA = 1/2
A = π/6 或 A = 5π/6
B + C = 5π/6 或 B + C = π/6
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展开全部
b = 2asinB
sinB = 2sinAsinB
sinA = 1/2
A = π/6 或 A = 5π/6
B + C = 5π/6 或 B + C = π/6
sinB = 2sinAsinB
sinA = 1/2
A = π/6 或 A = 5π/6
B + C = 5π/6 或 B + C = π/6
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