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Find the angle theta whose cosine is equ...

Find the angle `theta` whose cosine is equal to its tangent.

A

`cos theta = 2 cos 18^(@)`

B

`cos theta =2 sin 18^(@)`

C

`sin theta = 2 sin 18^(@)`

D

` sin theta = 2 cos 18^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
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ML KHANNA-TRIGONOMETRY RATIOS AND IDENTITIES-PROBLEM SET (4) ( MULTIPLE CHOICE QUESTIONS)
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  2. The vlaue of tan 81^(@) - tan 63^(@) - tan 27^(@)+ tan 9^(@) is equ...

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  3. Find the angle theta whose cosine is equal to its tangent.

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  6. Prove that :"sin"As in(60^0-A)s in(60^0+A)=1/4sin3A

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  7. If x is A.M. of tan "" ( pi )/( 9 ) and tan"" ( 5pi )/( 18) and y is A...

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  8. The value of sin""(pi)/(10)sin""(13pi)/(10) is

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  9. The value of 2tanpi/(10)+3secpi/(10)-\ 4cospi/(10) is 0 b. 1 c. sqrt(5...

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  10. The value of sin 50^(@) - sin70^(@) + sin 10^(@) is equal to

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  11. The value of sqrt3"cosec"20^@ - sec 20^@ is equal to

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  12. Expression (1)/(cos 290^(@)) + (1)/(sqrt(3) sin 250^(@)) equals

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  13. The value of (1)/( sin10^(@)) - ( sqrt( 3))/( cos 10^(@))=

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  14. The least value of cos^(2) theta - 6 sin theta cos theta + 3sin^(2) th...

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  15. If tanalpha=m/(m+1)a n dtanbeta=1/(2m+1) . Find the possible values of...

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  16. If tanA=(1)/(2) and tanB=(1)/(3), then tan(2A+B) is equal to

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  17. A = 18^(@)and cos 2A=

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

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  19. Prove that (tan^(2)2theta-tan^(2)theta)/(1-tan^(2)2thetatan^(2)theta)=...

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  20. ( sec 8 theta -1 )/( sec 4 theta -1) =

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