solve tanA+cot2A=2 by general solution of trigonometric equations
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sina/cosa+(cos2a/sin2a)=2
(sinasin2a+cosacos2a)/cosacos2a=2
cosa/cosacos2a=2
cos2a=1/2
2a=60
a!=30 degree
(sinasin2a+cosacos2a)/cosacos2a=2
cosa/cosacos2a=2
cos2a=1/2
2a=60
a!=30 degree
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