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cos^(2) 5^(@) + cos^(2) 10^(@) +cos^(2) ...

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

A

18

B

27

C

36

D

45

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AAKASH SERIES-TRIGONOMERTIC RATIOS-EXERCISE- II
  1. cos theta + cos ( pi + theta ) + cos (2pi + theta) + ...+2n terms =

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  2. sin^(4) theta + 2 sin^(2) theta (1-(1)/("cosec"^(2) theta ) )+ cos^(4)...

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

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  4. In Delta ABC, cos""((B+2C+3A)/(2))+ cos""((A-B)/(2))=

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  5. The ratio between (1+cos alpha)/(sin^(2) alpha) and a+((1+cos alpha)/(...

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  6. If theta = (pi)/(21), then (sin23 theta-sin 7 theta)/( sin2 theta + si...

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  7. If 1+sin theta + sin^(2) theta + ...oo= 4+2sqrt(3), 0 lt theta lt pi a...

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  8. If ( sin x + cos x)/(cos^(3)x)=a tan^(3)x+b tan^(2)x+c tan x+d then ...

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  9. If sin^(4) theta + cos^(4) theta = l + 3 +k sin^(2) theta cos^(2) thet...

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  10. If 4 sin theta + 3 cos theta =5 then tan theta =

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  11. If sqrt(sin x)+ cos x = 0 then sin x =

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  12. sin^(2) x=1-sinx then cos^(4)x+cos^(2)x=

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  13. If cos x + cos^(2) x =1 , " then " sin^(12) x + 3 sin^(10)x + 3sin^(8...

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  14. If sec A = 5x + (1)/(20x) then sec A + tan A =

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  15. If tan theta = p - (1)/(4p) then sec theta - tan theta =

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  16. sqrt(1-sin^(2)100^(@))*sec 100^(@)=

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  17. If sqrt((1+sin A)/(1-sin A))=sec A +tan A, then the quadrants in which...

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  18. If pi/2 lt theta lt pi then sqrt((1-sin theta)/(1+sin theta))+sqrt((1+...

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  19. If pi lt alpha lt 2pi then (1)/(Sin alpha - sqrt(cot^(2)alpha -cos^(2)...

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  20. ((sqrt(3) + 2 cosA)/( 1-2 sin A ))^(-3) + ((1+ 2 sin A )/( sqrt(3)-2 c...

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