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Mathematics 21 Online
OpenStudy (anonymous):

tan(a)+cot(2a)=

OpenStudy (anonymous):

=cosec2a

OpenStudy (anonymous):

tana+cot2a =(sina/cosa)+(cos2a/sin2a) taking the lcm which is sin2a, =(2sin^a+cos2a)/sin2a =(2sin^2a+1-2sin^2a)/sin2a =1/sin2a =cosec2a

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