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If 1+4 tan theta = 4 sec theta then cos...

If `1+4 tan theta = 4 sec theta ` then `cos theta=`

A

`17//8`

B

`8//17`

C

`-8//17`

D

`-17//8`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-TRIGONOMERTIC RATIOS-PRACTICE EXERCISE
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  8. (sin^(2)alpha)/(1+cot^(2) alpha) + (tan^(2)alpha)/((1+tan^(2) alpha)^(...

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  9. If (2 sin theta )/(1+ cos theta + sin theta )=x, find the value of (1...

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  12. If sin theta + sin^(2) theta =1 then cos^(4) theta + cos^(8) theta + 2...

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  13. If sqrt((1+cos alpha)/(1-cos alpha))=cosec alpha + cot alpha, then the...

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  14. If cos theta - sin theta = sqrt(2) sin theta " then " cos theta + si...

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  15. If Cos theta - Sin theta = sqrt(2) Cos theta then Cos theta + Sin thet...

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  16. If a = Cos theta - Sin theta, b = Cos^(3) theta - Sin^(3) theta, then

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  17. If sec^(6) theta - tan^(6) theta = a sec^(4) theta + b sec^(2) theta +...

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  18. If x=r cos alpha cos beta cos gamma , y= cos alpha cos beta sin gamma...

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  19. If x= cot theta + cos theta , y= cot theta - cos theta , " then " (x^...

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