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Find the exact value of the expression t...

Find the exact value of the expression `tan(pi/20)-tan((3pi)/20)+tan((5pi)/20)-tan((7pi)/20)+tan((9pi)/20).`

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Find the exact value of the expression tan((pi)/(20))-tan((3 pi)/(20))+tan((5 pi)/(20))-tan((7 pi)/(20))+tan((9 pi)/(20))

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ARIHANT MATHS-TRIGONOMETRIC FUNCTIONS AND IDENTITIES-Exercise (Single Integer Answer Type Questions)
  1. In a DeltaA B C ,1/(1+tan^2(A/2))+1/(1+tan^2(B/2))+1/(1+tan^2(C/2))=k ...

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  2. If (sinalpha)/(sinbeta)=(cosgamma)/(cosdelta), then (sin((alpha-beta)/...

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  3. Find the exact value of the expression tan(pi/20)-tan((3pi)/20)+tan((5...

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  4. Let x=(sum(n=1)^(44) cos n^(@))/(sum(n=1)^(44) sin n^(@)) , find the g...

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  5. Find theta (in degree) satisfying the equation,tan 15^@ *tan 25^@* ta...

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  6. Find the exact value of cosec10^@ + cosec50^@ - cosec70^@.

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  7. If cos 5 alpha=cos^5 alpha, where alpha in (0,pi/2) then find the poss...

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  8. tan^2 (pi/16) + tan^2 ((2pi)/16) + tan^2((3pi)/16).........+tan^2((7pi...

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  9. Compute the square of the value of the expression (4+sec 20^@)/(cosec ...

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  10. In DeltaABC, if (sinA)/(3)=(cosB)/(3)=(tanC)/(2), then the value of ...

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  11. It f and g be function defined by f(theta) = cos^2 theta and(theta) = ...

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  12. If sum of the series 1+x log(|(1-sinx)/(cos x)|)((1+sin x)/(cos x))^(1...

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  13. If 9x/costheta+5y/sintheta=56 and 9xsintheta/cos^2theta-5ycostheta/sin...

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  14. The angle A of the DeltaABC is obtuse. x = 2635 - tan B tan C, if [x]...

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  15. If cos3 6^(@)+cot(7 1/2@)=sqrt(n1)+sqrt(n2)+sqrt(n3)+sqrt(n1)+sqrt(n5)...

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  16. If sin^(2)A=x and underset(r=1)overset(4)Pi sin (r A)=ax^(2)+bx^(3)+cx...

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  17. If x , y in R satisfies (x+5)^2+(y-12)^2=(14)^2, then the minimum val...

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  18. The least degree of a polynomial with integer coefficient whose one of...

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  19. If A+B+C=180^(@), (sin 2A+sin 2B+sin2C)/(sinA+sinB+sinC)=k sin. (A)/(2...

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  20. The value of f(x)=x^4+4x^3+2x^2-4x+7, when x=cot(11pi)/8 is

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