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question mark

let cos(x+y) = 4/5 and sin(x-y) = 5/13 then tan2x =

shubham tibra , 12 Years ago
Grade 11
anser 1 Answers
Kaushik Kumar

Last Activity: 12 Years ago

tan 2x = tan(x+y + x-y)

         ={tan(x+y)+tan(x-y)}/(1-tan(x+y)tan(x-y))

   ={3/4+5/12}/(1-3/4*5/12)

 =56/33


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