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If x,y are positive acute angles, x+ylt9...

If x,y are positive acute angles, `x+ylt90^(@) and sin(2x-20^(@))=cos(2y+20^(@))`, then value of `sec(x+y)` is,

A

5

B

`sqrt(2)`

C

2

D

3

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The correct Answer is:
B
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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TRIGONOMETRY -EXERCISES (Multiple Choice Questions)
  1. If costhetacosec23^(@)=1, the value of theta is

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  2. If sin(x+y)=cos(x-y), then find the value of cos^(2)x.

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  3. If x,y are positive acute angles, x+ylt90^(@) and sin(2x-20^(@))=cos(2...

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  4. If A and B are complementary angles, find the value of sqrt((tanAtanB+...

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  5. A and B are complementary angles, then find the value of sinAcosB+cosA...

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  6. If theta is an acute angle and sintheta=costheta, then find the value ...

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  7. If sin(x+y)=cos[3(x+y)], then the value of tan[2(x+y)] is.

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  8. If sec(5theta-50^(@))=cosec(theta+32^(@)), then the value of theta is:...

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  9. If x=asinthetaandy=btantheta, then the value of (a^(2))/(x^(2))-(b^(2)...

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  10. If x=asinthetaandy=btantheta, then the value of (a^(2))/(x^(2))-(b^(2)...

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  11. If x=asecthetacostheta,y=bsecthetasinthetaandz=thetatantheta, then fin...

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  12. Find the value of 3sin20^(@)-4sin^(3)20^(@).

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  13. Find the value of 3cos20^(@)-4cos^(3)20^(@).

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  14. If cos^(2)alpha+cos^(2)beta=2, the value of tan^(3)alpha+sin^(5)beta i...

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  15. Find the value of tan^(n)1^(@)tan^(n)2^(@)tan^(n)3^(@)......tan^(n)8...

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  16. Find the value of tan^(n)1^(@)tan^(n)2^(@)tan^(n)3^(@)......tan^(n)8...

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  17. The product cos1^(@)cos2^(@)cos3^(@)cos4^(@)......cos100^(@). Is equal...

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  18. Find the value of cos1^(@).cos2^(@).cos3^(@).cos90^(@)

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  19. Find the value of sin1^(@).sin2^(@).sin3^(@)…sin180^(@).

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  20. Find the value of sin^(2)1^(@)+sin^(2)2^(@)+sin^(2)3^(@)+ ----+sin^(...

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