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If theta is an acute angle such that tan...

If `theta` is an acute angle such that `tan^2theta=8/7` , then the value of `((1+sintheta)(1-sintheta))/((1+costheta)(1-costheta)` is (a) `7/8` (b) `8/7` (c) `7/4` (d) `(64)/(49)`

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS-All Questions
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  2. If tantheta=3/4, then cos^2theta-sin^2theta= (a) 7/(25) (b) 1 (c) -7/...

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  3. If theta is an acute angle such that tan^2theta=8/7 , then the value o...

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  4. If 3costheta=5sintheta, then the value of (5sintheta-2sec^3theta+2cost...

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  5. If tan^2 45^@-cos^2 30^@=xsin45^@ \ cos45^@, then x is (a) 2 (b) -2 (c...

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  6. The value of cos^2 17^@ - sin^2 73^@ is (a) 1 (b) 1/3 (c) 0 (d) -1

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  7. The value of (cos^3 20^@-cos^3 70^@)/(sin^3 70^@-sin^3 20^@) is (a) 1/...

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

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

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

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

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

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

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

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

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

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

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  18. (2tan3 0^(@))/(1-tan^2 3 0^(@))is equal to (a)sin60^(@) (b) cos60^(@) ...

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  19. (1-tan^2 45^@)/(1+tan^2 45^@) is equal to

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

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