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

`cos^(2) A + cos^(2) ( 120^(@) + A)+ cos^(2) (120^(@) - A )= `

A

`3//2`

B

`1//2`

C

`3//18`

D

`1//4`

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The correct Answer is:
A
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The minimum value of cos^(3) x+ cos^(3) (120^(@) + x) + cos^(3) (120^(@) -x) is

Statement - I : Period of cos^(3) x + cos^(3) (120^(0) - x) + cos^(3) (120^(0) + x ) is (pi)/(3) Statement -II : Period of cos((2pi x)/ 3 ) + sin((pix)/2) - tan ((pi x )/ 4) is 12 Which of the above statement is correct.

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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 C ( MULTIPLE AND SUBMULTIPLE ANGLES )
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  2. sin^(2) theta + sin^(2)(60^@ + theta ) + sin^(2)(60^(@) - theta ) =

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  4. cos^(3) theta + cos^(3) ( 120^(@) +theta ) + cos^(3) (120^(@) - theta ...

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  5. sin^(2) 20^(@) + sin^(2) 100^@ + sin^(2) 140^(@) =

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  6. cos^(3) 20^(@) + cos^(3) 100^(@) + cos^(3) 140^(@) =

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  7. cos^(2)(theta-45^(@))+cos^(2)(theta+15^(@)-cos^(2)(theta-15^(@))=

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  8. If 4 sin(60^(@) + theta ) sin (60^(@) - theta )-1=k cos 2 theta , th...

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