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If cosec^2x-cot^2y=1 then cos(x-y)=...

If `cosec^2x-cot^2y=1` then cos(x-y)=

A

0

B

`-1`

C

1

D

`1/2`

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UNITED BOOK HOUSE-TAMLUK HAMILTON HIGH SCHOOL-EXERCISE
  1. Area of triangle = 1/2xx basexxheight- it is variation is

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  2. The angle in the segment of a circle which is less than a semi circle ...

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  3. If cosec^2x-cot^2y=1 then cos(x-y)=

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  4. Area of three consecutive surfaces of a cuboid are x,y,z. The volume o...

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  5. (10xx1)+(10xx2)+…..+(10xx8)=

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  6. Fill in the blanks If the interest of Rs 10 in 1 year is Rs 1, then ...

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  7. Fill in the blanks If the eqation ax^2+bx+c=0 is not a quadratic equ...

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  8. Fill in the blanks The area bounded by two radius and their adjacent...

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  9. Fill in the blanks Maximum value of 1/(sec theta) is.

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  10. Fill in the blanks Formed by completely (360^@) revolving a right an...

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  11. Fill in the blanks If the mean of frequency distribution is 20, sumf...

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  12. Write True or False If there is not clearly mentioned in the contrac...

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  13. Write True or False If (5x-2y):(2x+3y) = 2:3 then x:y = 12:11

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  14. Write True or False Maximum four common tangents can draw to two cir...

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  15. Write True or False Trigonometrical angle may be less than 0^@, not ...

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  16. Write True or False If the inner and outer radii of a hollow sphere ...

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  17. Write True or False If n is even then (n+1)/2th term is the median.

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  18. In a business, the ratio of investment of A and B is 3:2. 5% of total ...

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  19. If a/2=b/3=c/5=(3a-5b+4c)/(K) then find the value of K.

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  20. Find the quadratic equation whose one of the root is 2+sqrt5.

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