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cos^2theta+cos^2(120^@+theta)+cos^2(120^...

`cos^2theta+cos^2(120^@+theta)+cos^2(120^@-theta)=.....`

A

`2//3`

B

`3//2`

C

`4//5`

D

`5//4`

Text Solution

Verified by Experts

The correct Answer is:
B
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MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES AND FACTORIZATION FORMULAE-MCQs
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  2. For any angle theta, costheta+cos(120^@+theta)+cos(120^@-theta)=.........

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  3. cos^2theta+cos^2(120^@+theta)+cos^2(120^@-theta)=.....

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  4. If (sin8theta.costheta-sin6theta.cos3theta)/(cos2theta.costheta-sin3th...

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  5. sqrt(3)cot2 0^(@)-4cos2 0^(@)=

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  10. Evaluate : sin163^@.cos347^@+sin73^@.sin167^@.

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  11. cos^4(pi/8)+cos^4((3pi)/8)+cos^4((5pi)/8)+cos^4((7pi)/8)=

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  12. 1/cos290^@+1/(sqrt3 sin250^@)=

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  13. If tan(pi.costheta)=cot(pi.sintheta), then: cos((pi)/(4)-theta)=..... ...

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  14. (sin^2A-sin^2B)/(sinA.cosA-sinB.cosB)=....

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  15. If x^0=((13pi)/(6))^c, then: x=(a) 300^@ (b) 930^@ (c) 309^@ (d) 390^@

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  18. Find the value of sin^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+..............

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  19. If tanalpha=(1)/(3)andtanbeta=(1)/(2), then: tan(alpha+beta)=

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  20. If cos e ctheta+cottheta=(11)/2 , then t a ntheta=

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