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Question

If tanθ=5/12,θ is not in the second quadrant, then show that sin(360θ)+tan(90+θ)sec(270+θ)+csc(θ)=181338

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Solution

tanθ=(512)=veandθisnotinsecondquadrantthenθisinforthquadrantandhencesinθ=(513)andcosθ=(1213)now(sin(3600θ)cotθsec(2700+θ)+cosec(θ))=(sin(θ)cotθcosecθcosecθ)=(sinθcotθ2cosecθ)=(sinθ+cotθ2cosecθ)=((513)(125)2×(135))=(25+15613×5×2×13)×5=(181338)=RHS


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