CosA=2/5 We know that, =tan2 A =(1-cos^2A)/(1+cos^2A) =4+4{1-(2/5)^2}/{1+(2/5)^2} =4+4{1-4/25}/{1+4/25} =4+4(25-4)/(25+5) =4+84/29=116+84/29 =200/29 =6.89

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Shubham Saxena ???? 5 years, 2 months ago

Sorry I have mistake that I selected science in form of subject . This is a question of mathematics .

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