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Find the extreme values of 11 cos^...

Find the extreme values of
`11 cos^(2) x+ 15 sin x cos x- 9 sin^(2) x`.

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The correct Answer is:
`-1,1`
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AAKASH SERIES-PERIODICITY EXTREME VALUES AND GRAPHS -ADDITIONAL EXERCISE
  1. Find the period of (i) | tan x | cos 2 x (ii) 2 sin^(4) x...

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  2. If the function f(x ) = (sin n x)/( sin ((x )/(n ))) n E Z has per...

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  3. Find the period of log (e ) (sin^-1(x- [x]))

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  4. Show that sin 5x + cos (sqrt(5) pi x) is non- periodic .

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  5. Find the period of sin x + tan (x )/( 2) + sin ( x)/(2^(2)) + tan...

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  6. Find the period of cos (cos x) + cos ( sin x).

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  7. Find the period of cos^(2) x+ cos^(4) x

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  8. Find the period of e^(logsinx) + tan^(3) x - cosec (3 x-5)

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  9. Find the greatest or lest values of a^(2) sin^(2) theta + b^(2) ...

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  10. Find the greatest of least values of a^(2) sec^(2) theta b^(2) ...

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  11. Show that the range of sin^(2) theta + cos^(4) theta si [(3)/(4...

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  12. Show that the range of the function f(x ) = (sin^(2) x + cos^(4) x)...

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  13. Find the range of log(1//5) [ sqrt(2) (cos x + sin x) + 3]

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  14. The minimum value of 2^(sin x)+2^(cos x) is

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  15. If 5 cos x+ 12 cosy=13 , then the maximum value of 5sin x+ 12 sin y i...

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  16. The minimum value of cos^(3) x+ cos^(3) (120^(@) + x) + cos^(3) (120^...

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  17. Find the maximum minimum values of sin^(3) theta + cos^(3) the...

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  18. Find the extreme values of 11 cos^(2) x+ 15 sin x cos x- 9 si...

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  19. Find the extreme values of (1+ sin ((pi)/(4) + x) + cos ((pi)/(4...

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  20. Find the extreme values of cos^(2) theta - sin^(2) theta

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