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If cos(x-y), cosx and cos(x+y) are in H....

If `cos(x-y), cosx and cos(x+y)` are in H.P., then `|cos x sec (y)/(2)|` equals

A

`pm sqrt(2)`

B

`pm sqrt(3)`

C

`pm sqrt(2)`

D

`pm 1`

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The correct Answer is:
A
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MCGROW HILL PUBLICATION-PROGRESSIONS-EXERCISES LEVEL-1 (Single Correct Answer Type Questions)
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  2. Find the harmonic mean of the roots of the equation (5+sqrt2)x^2-(4+sq...

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  3. If cos(x-y), cosx and cos(x+y) are in H.P., then |cos x sec (y)/(2)| e...

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  4. Let Sn=1+1/2+1/3+1/4+......+1/(2^n-1). Then

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  5. Let S=4/19+44/(19)^2+444/(19)^3+...oo then find the value of S

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  6. 29. If a,b,c are in G.P. and a^(1/x)=b^(1/y)=c^(1/z) prove that x, y, ...

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  7. If a,b,c,d are in GP and a^x=b^x=c^z=d^u, then x ,y,z,u are in

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  8. If a ,b ,c ,da n dp are distinct real numbers such that (a^2+b^2+c^2)p...

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  9. If a,b,c are in A.P., then 2^(ax+1),2^(bx+1),2^(cx+1), x in R, are in

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  10. The rational number, which equals the number 2.bar 357 with recurring ...

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  11. The sum to infinity of the series 1+(4)/(5)+(7)/(5^(2))+(10)/(5^(3))...

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  12. If the sum of n terms of an A.P. is 3n^(2)+5n and its mth term is 164,...

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  13. If G1 and G2 are two geometric means and A is the arithmetic mean inse...

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  14. If A(1),A(2) be two A.M.'s and G(1),G(2) be two G.M.,s between a and b...

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  15. The first and last term of an A.P. are a and l respectively. If S be t...

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  16. The value of 2^(1/4).4^(1/8).8^(1/16),,,,,,,oo is equal to.

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  17. . The sum of an infinite number of terms of a G.P. is 20, and the sum ...

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  18. The eighth term of a geometric progression is 128 and common ratio is ...

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  19. l, m,n are the p^(th), q ^(th) and r ^(th) term of a G.P. all positive...

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  20. If a1, a2, a3, be terms of an A.P. if (a1+a2++ap)/(a1+a2++aq)=(p^2)/(...

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