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Find the value of 1/2sec80^@-2cos20^@...

Find the value of `1/2sec80^@-2cos20^@`

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UNITED BOOK HOUSE-KALIDHAN INSTITUTION-EXERCISE
  1. Prove that,sqrt((sectheta-1)/(sectheta+1))=cosectheta-cottheta

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  2. If A,B,C are positive acute angles and tan A=4/7and tan B=1/7,tan C=1/...

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  3. Find the value of 1/2sec80^@-2cos20^@

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  4. Find out the three cube-roots of 8.

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  5. In how many ways can the results of the three football matches be pred...

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  6. State the binomial theorem for a positve integral index.

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  7. Is 600 a terms of the A.P{7,11,15,19,…}.Give reason for your answer.

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  8. Find the equation of the line which passes through the point (4,-6)and...

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  9. The co-ordinates of a moving point P are.[a/2(cosectheta+sintheta)b/2(...

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  10. Find the value of p so that the roots of the equation 3x^2-2(7+9p)x+(8...

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  11. Do you think 4 as a complex number?if so why ?

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  12. Two unbaised dice are rolled together.Find the probability getting 2 d...

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  13. What is the chance that a leap year selected at random will contain 53...

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  14. sinalpha+sinbeta=aand cosalpha+cosbeta=bprove that ,tan((alpha-beta)/2...

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  15. sintheta=ksin(theta+phi).show that tan(theta+phi)=(sinphi)/(cosphi-K)

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  16. Prove by the principle of mathematical induction that.4^n+15n-1is a mu...

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  17. If w be a imaginary cube root of uniyt and a+b+c=0 then show that (a+b...

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  18. In a machine,there is a password of five characters of which the first...

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  19. If the term independetn of x in the expansion of (k/3x^2-3/(2x))^9be 2...

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  20. Find the sum :3.1^2+4.2^2+5.3^2+....upto n terms.

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