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(1-tan^2 45^@)/(1+tan^2 45^@) is equal t...

`(1-tan^2 45^@)/(1+tan^2 45^@)` is equal to

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS-All Questions
  1. The value of (cos^3 20^@-cos^3 70^@)/(sin^3 70^@-sin^3 20^@) is (a) 1/...

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  2. If A and B are complementary angles, then (a) sinA=cosB (b) cosA=s...

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  3. If xsin(90^@-theta)cot(90^@-theta)=cos(90^@-theta) , then x=

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  4. If xtan45^@cos60^@=sin60^@cot60^@ , then x is equal to

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  5. If angles A ,\ B ,\ C of a /\A B C form an increasing A P , then sinB=...

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  6. If theta is an acute angle such that sec^2theta=3 , then the value...

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  7. The value of tan1otan2otan3oddottan89o is (a) 1 (b) -1 (c) 0 (d) No...

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  8. The value of cos1^@cos2^@cos3^@ .......................................

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  9. The value of tan10otan15otan75otan80o is -1 (b) 0 (c) 1 (d) None of...

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  10. If theta and 2theta-45^@ are acute angles such that sintheta=cos(2thet...

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  11. If 5theta and 4theta are acute angles satisfying sin5theta=cos4theta...

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  12. (2tan3 0^(@))/(1-tan^2 3 0^(@))is equal to (a)sin60^(@) (b) cos60^(@) ...

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  13. (1-tan^2 45^@)/(1+tan^2 45^@) is equal to

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  14. sin2A=2sinA is true when A= (a) 0^@ (b) 30^@ (c) 45^@ (d) 60^@

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  15. (2tan30^@)/(1-tan^2 30^@) is equal to (a) cos60^@ (b) sin60^@ (c) tan6...

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  16. If A, B and C are interior angles of a triangle ABC, then show that "s...

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  17. If costheta=2/3 , then 2sec^2theta+2tan^2theta-7 is equal to (a) 1 (b)...

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  18. tan5oxxtan30oxx4tan85o is equal to 4/(sqrt(3)) (b) 4sqrt(3) (c) 1 (d) ...

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  19. In Fig. 5.47, the value of cosvarphi is (FIGURE) 5/4 (b) 5/3 (c) 3/...

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  20. In Figure, A D=4c m , B D=3c m and C B=12 c m , find cottheta . (a) (1...

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