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The value of sin 50^(@) - sin70^(@) + si...

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

A

1

B

0

C

`1//2`

D

2

Text Solution

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The correct Answer is:
B
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ML KHANNA-TRIGONOMETRY RATIOS AND IDENTITIES-PROBLEM SET (4) ( MULTIPLE CHOICE QUESTIONS)
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  2. The value of 2tanpi/(10)+3secpi/(10)-\ 4cospi/(10) is 0 b. 1 c. sqrt(5...

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

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

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

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

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

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

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

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

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

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

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

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  14. Prove that (cosalpha+cosbeta)^2+(sinalpha+sinbeta)^2=4cos^2((alpha-bet...

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  15. ( cos alpha - cos beta )^(2) + ( sin alpha - sin beta )^(2) =

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  16. Prove that: ((cosA+cos B)/(sinA-s inB))^n+((sinA+s inB)/(cosA-cosB))^n...

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  18. Let alpha, beta be such that pi lt alpha - beta lt 3pi . If sin alpha...

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  19. The roots of both the equation sin^(2) x + p sin x + q = 0 and cos^(2...

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