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If `theta_1,theta_2,theta_3, ,theta_n` are in AP, whose common difference is `d` , show that `sectheta_1s e ctheta_2+s e ctheta_2sectheta_3+....+sectheta_(n-1)sectheta_n=(t a ntheta_n-t a ntheta_1)/(sind)`

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
  1. If S1 be the sum of (2n+1) term of an A.P. and S2 be the sum of its od...

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  2. Divide 32 into four parts which are in A.P. such that the product of ...

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  3. If theta1,theta2,theta3, ,thetan are in AP, whose common difference ...

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  4. If (m+1) term of an A.P. is twice the(n+1) th term, prove that (3m+1) ...

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  5. If a1,a2,a3, ,an are in A.P. with common difference d(w h e r ed!=0), ...

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  6. If an A.P. is such that (a4)/(a7)=2/7, find (a6)/(a8) .

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  7. The 4th term of an A.P. is three times the first and the 7th term e...

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  8. Find the number of terms common to the two AP's 3,7,11,15.... 407 and...

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  9. the sum of terms equidistant from the beginning and end in an A...

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  10. If a1,a2,a3, ,an are an A.P. of non-zero terms, prove that 1/(a1a2)+...

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  11. If a1,a2,a3, ,an are in A.P., where ai >0 for all i , show that 1/...

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  12. The p^(t h) term of an A.P. is a and q^(t h) term is b Prove that t...

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  13. If S1,S2, S3, Sm are the sums of n terms of m A.P. ' s whose first ter...

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  14. Let Sn be the sum of first n terms of an A.P. with non-zero common d...

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  15. If there are (2n+1) terms in A.P., then prove that the ratio of the su...

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  16. The ratio of the sum of n terms of two A.P. s is (7n+1):(4n+27) . Fin...

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  17. Show that x^2+x y+y^2,z^2+xz+x^2, y^2+y z+z^2, are consecutive terms o...

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  18. If a ,b ,c are in A.P., prove that: i.(a-c)^2=4(a-b)(b-c) ii.a^2+c^2...

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  19. Find the sum of all those integers between 100 and 800 each of which o...

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  20. If the sum of m terms of an A.P. is equal to the sum of either the nex...

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