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The value of the expression (sin80^(@)-c...

The value of the expression `(sin80^(@)-cos80^(@))` is negative.

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False
We know that, `sintheta` is increasing when, `0^(@)lethetale90^(@)` and `costheta` is decreasing when, `0^(@)lethetale90^(@)`.
`therefore sin80^(@)-cos80^(@)gt0` (positive)
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NCERT EXEMPLAR-INTRODUCTION TO TRIGoNOMETRY AND ITS APPLICATIONS-Introduction To Trigonometry And Its Applications
  1. value of (tan47^(@))/(cot 43^(@))=

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  2. The value of the expression (cos^(2)23^(@)-sin^(2)67^(@)) is

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  3. The value of the expression (sin80^(@)-cos80^(@)) is negative.

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  4. sqrt((1-cos^(2)theta)sec^(2)theta)=tan theta

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  5. If cosA+cos^2A=1 , then sin^2A+sin^4A= -1 (b) 0 (c) 1 (d) None of ...

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  6. (tantheta+2)(2 tantheta+1)= ?

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  7. If the length of the shadow of a tower is increasing, then the angle o...

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  8. If a man standing on a platform 3 m above the surface of a lake observ...

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  9. The value of 2sintheta can be a+1/a, where a is a positive number and ...

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  10. costheta=(a^(2)+b^(2))/(2ab), where a and b are two distinct numbers s...

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  11. The angle of elevation theta of the top of a tower is 30^(@). If the h...

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  12. If the height of a tower and the distance of the point of observation ...

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  13. Prove that (sintheta)/(1+costheta) + (1+costheta)/(sintheta) = 2 cosec...

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  14. (tanA)/(1+secA) - (tanA)/(1-secA) = 2cosecA

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  15. If tan A=3/4, then sinAcosA =.

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  16. (sinalpha + cosalpha)(tanalpha + cotalpha) = secalpha + cosecalpha

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  17. Prove that (sqrt(3)+1)(3-cot30^@)=tan^3(60)^@-2sin60^@

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  18. Show that 1+cot^2alpha/(1+cosecalpha)=cosec alpha

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  19. tantheta+tan(9 0^(@)-theta)=secthetaxxsec(9 0^(@)-theta)

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  20. Find the angle of elevation of the Sun when the shadow of a pole h m ...

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