(1+sin (2B))/(cos^2 (B)-sin^2 (B))=-3 #求tan B 角B是三角形一内角
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(1+sin(2B))/(cos^2(B)-sin^2(B))=-3#求tanB角B是三角形一内角(1+sin(2B))/(cos^2(B)-sin^2(B))=-3#求tanB角B是三角形一内角(1
(1+sin (2B))/(cos^2 (B)-sin^2 (B))=-3 #求tan B 角B是三角形一内角
(1+sin (2B))/(cos^2 (B)-sin^2 (B))=-3 #求tan B 角B是三角形一内角
(1+sin (2B))/(cos^2 (B)-sin^2 (B))=-3 #求tan B 角B是三角形一内角
[1+sin(2B)]/(cos²B-sin²B)= -3
(sinB+cosB)²/[(cosB+sinB) (cosB-sinB)]= -3
(cosB+sinB)/ (cosB-sinB)]= -3
sinB=2cosB
tanB=2
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