[" If "tan(A)/(2)=r," then the value of ...

[" If "tan(A)/(2)=r," then the value of "(sec A+tan A)" is equal to "],[[" (A) "(2+r)/(2-r)," (B) "(2-r)/(2+r)," (C) "(1+r)/(1-r)," (D) "(1-r)/(1+r)]]

[" If "tan(A)/(2)=r," then the value of "(sec A+tan A)" is equal to "]...
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The value of sum(r=2)^(100)(3^(r)(2-2r))/(r(r+1)(r+2)) is equal to
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sum(r=0)^(oo)tan^(-1)((r((r+1)!))/((r+1)+((r+1)!)^(2))) is equal
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sum(r=1)^(n)tan((x)/(2^(r)))sec((x)/(2^(r-1)));r,n in N
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Prove that (r+r1)tan((B-C)/2)=(r+r2)(tan(C-A)/2)=(r+r3)(tan(A-B)/2)=0
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If y=sum(r=1)^(x) tan^(-1)((1)/(1+r+r^(2))), then (dy)/(dx) is equal t...
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Sigma(r=1)^(oo) tan^(-1) (2/((r +2))) is
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If t(r) = (r+2)/(r(r+)). 1/(2^(r+1)) then sum(r=1)^(n) is equal to
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