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(a) If f(x)=(x-1)/(x+1) then show that. ...

(a) If `f(x)=(x-1)/(x+1)` then show that.
(i) `f((1)/(x))=-f(x)`
(ii) `f(-(1)/(x))=-(1)/(f(x))`.
(b) Prove that `cos20^(@)cos40^(@)cos80^(@)=1//8`

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FULL MARKS-SAMPLE PAPER 12-PART
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  2. Find the derivative of x^(cosx) with respect to x.

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  3. Evaluate int(1)/(4-x^(2))dx.

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  7. Find the equation of the locus of a point such that the sum of the squ...

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  8. If A^(T)=[(4,5),(-1,0),(2,3)]and B=[(2,-1,1),(7,5,-2)], verify the ...

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  9. Show that the points whose position vectors are 2veci+3vecj-5veck,3vec...

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  10. Test the existance of the limit lim(xto1)(4|x-1|+x-1)/(|x-1|),xne1

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  11. If y=tan^(-1)((1+x)/(1-x)) find y'.

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  12. Evalute int(5x^(2)-4+(7)/(x)+(2)/(sqrt(x)))dx

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  13. If x^(2) + x + 1 is a factor of the polynomial 3x^(3) + 8x^(2) + 8x ...

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  14. (a) If f(x)=(x-1)/(x+1) then show that. (i) f((1)/(x))=-f(x) (ii) ...

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  15. Determine the region in the plane determined by the inequalities. x l...

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  16. If the letters of the word GARDEN are permuted in all possible ways an...

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  17. If y=x+x^(2)/2+x^(3)/3+x^(4)/4+... then show that x=y-y^(2)/(2!)+y^(3)...

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  18. If A(i),B(i),C(i) are the cofactors of a(i),b(i),c(i) respectively,i=1...

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  19. lim(alphato0)(sin(alpha^(n)))/((sinalpha)^(m))

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  20. (a) Find (dy)/(dx) where y=(x^(2)+1)root(3)(x^(2)+2) (b) Evaluate ...

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