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If cos (20^@+A) = sin 30^@, then the val...

If `cos (20^@+A) = sin 30^@`, then the value of A is :

A

`30^@`

B

`40^@`

C

`60^@`

D

`20^@`

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R G PUBLICATION-MODEL PAPER 2-EXERCISE
  1. If PQR~XYZ, Q=50^@ and R=70^@, then X+ Y is equal to:

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  2. If sqrt2sin (60^@ -alpha)= 1, then alpha is :

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  3. If cos (20^@+A) = sin 30^@, then the value of A is :

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  4. If x=a,y=b is the solution of the equations x-y=2 and x+y=4 then the v...

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  5. Explain why 7xx6xx5xx4xx3xx2xx1+7 is a Composite Number.

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  6. Prove that 15+17sqrt3 is an irrational number.

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  7. Divide x^4-3x^2+4x+5 by x^2-x+1, find quotient and remainder.

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  8. Without drawing graphs, check whether the following pair of linear equ...

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  9. Find the value of tan 60^@ geometrically.

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  10. Prove that : sqrt((sectheta-1)/(sectheta+1))+sqrt((sectheta+1)/(secthe...

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  11. Show that 6+sqrt2 is irrational.

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  12. On dividing 3x^3-2x^2+5x-5 by a polynomial p(x), the quotient and rema...

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  13. lf costheta-sintheta=sqrt2sintheta prove that costheta+sintheta=sqrt2c...

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  16. In a trapezium ABCD, AB is parallel to CD and AB = 2CD. If area of Del...

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  17. If alpha,beta are the zeroes of the polynomial x^2-3x+ 2, then find th...

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  18. Find the sum of all the two-digit natural number which are divisible b...

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  19. Find the value of the middle most term(s) of the arithmetic progressio...

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