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Evaluate cos^(2)45^(@)+cos^(2)135^(@)+co...

Evaluate `cos^(2)45^(@)+cos^(2)135^(@)+cos^(2)225^(@)+cos^(2)315^(@)`.

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cos^(2)25^(@)+cos^(2)35^(@)-cos25^(@) cos35^(@)=

cos^(2) 5^(@) + cos^(2) 10^(@) +cos^(2) 15^(@)+...+cos^(2)360^(@)=

cos^(2) 45^(@) - sin^(2) 15^(@)=

cos^(2) 9^(@)+cos^(2)18^(@)+cos^(2) 27^(@)+...+cos^(2)81^(@)=

cos^(2) 36^(@) + cos^(2) 72^(@)=

cos^(2)5^(@)+cos^(2)10^(@)+cos^(2)15^(@)+.....+cos^(2) 90^(@)=

cos^(2)1^(@)+ cos^(2)2^(@)+cos^(2)3^(@)+....+cos^(2)90^(@)=

Cos^(2)20^(@)+Cos^(2)40^(@)+cos^(2)80^(@)=

( cos^(2) 33^(@) - cos^(2) 57^@)/( sin 21^(@) - cos 21^(@))=

Find the value of cos^(2)45^(@)-sin^(2)15^(@)

AAKASH SERIES-TRIGONOMERTIC RATIOS-PRACTICE EXERCISE
  1. Evaluate cos^(2)45^(@)+cos^(2)135^(@)+cos^(2)225^(@)+cos^(2)315^(@).

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  2. Sec ((15pi)/4) =

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  3. cos ((5pi)/(4)) - sin ((5pi)/(4)) + tan((11pi)/(4)) - cot((11pi)/(4))=

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  4. The cotangents of the angles pi//3, pi//4, pi//6 are in

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  5. ( sqrt(1-cos^(2)200^(@)))cosec 200^(@)=

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  6. If x= cos 10^(@) - sin 10^(@) then

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  7. Which of the following is not possible ?

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  8. The equation sin x= k + 1/k ( k gt 0) is

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  9. Which one of the following is true ?

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  10. I: If x= sin 1 , y= sin1^(@) then x lt y II : If x = cos 1 , y ...

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  11. If A=tan 1, B = tan. 9/5 then

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  12. A= sin 1, B = cos 1, C = tan 1 then the ascending order is

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  13. If Sin theta(1) + Sin theta(2) + Sin theta(3) = 3 then Cos theta(1) + ...

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  14. If Cos theta(1) + Cos theta(2) + Cos theta(3) = 3 then Sin theta(1) +...

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  15. If cos theta + sec theta = 2 then cos^(n) theta + sec^(n) theta =

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  16. If cot theta + tan theta = 2 then cot^(n) theta + tan^(n) theta =

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  17. If cot ( alpha + beta) = 0 then sin ( alpha + 2 beta) =

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  18. If tan ( alpha + beta) = sqrt(3), tan ( alpha - beta ) =1 then tan 6 ...

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  19. If n is even then sin theta + sin ( pi + theta ) + sin (2 pi + theta) ...

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  20. sin 10^(@) + sin 20^(@) + sin30^(@) + .......sin 360^(@)=

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  21. cos 20^(@) + cos 40^(@) + cos 60^(@) +...+cos160^(@)+cos 180^(@)=

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