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cot ^(2) "" (pi)/(6) + cosec ""(5pi)/(6)...

`cot ^(2) "" (pi)/(6) + cosec ""(5pi)/(6) + 3 tan ^(2) ""(pi)/(6) =6`

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NCERT BANGLISH-TRIGONOMETRIC FUNCTIONS -EXERCISE 3.3
  1. sin ^(2)(pi/6) + cos ^(2)(pi/3) - tan ^(2)(pi/4) =- 1/2

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  2. 2 sin ^(2) "" (pi)/(6) + cosec ^(2) "" (7pi)/(6) cos ^(2) "" (pi)/(3) ...

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  3. cot ^(2) "" (pi)/(6) + cosec ""(5pi)/(6) + 3 tan ^(2) ""(pi)/(6) =6

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  4. 2 sin ^(2) "" (3pi)/(4) + 2 cos ^(2) "" (pi)/( 4) + 2 sec ^(2) "" (pi)...

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  5. Find the value of: (i) sin 75^(@) (ii) tan 15 ^(@)

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  6. cos ((pi)/(4) - x) cos ((pi)/(4) -y) - sin ((pi)/(4) -x) sin ((pi)/(4)...

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  7. (tan ((pi)/(4) +x))/( tan ((pi)/(4) -x ))= ((1 + tan x )/( 1- tan x ))...

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  8. (cos (pi +x) cos (-x))/( sin (pi -x) cos ((pi )/(2) + x))= cot ^(2) x

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  9. cos ((3pi )/( 2 ) + x) cos (2pi + x) [cot ((3pi)/( 2)- x ) + cot (2pi ...

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  10. sin (n +1) x sin (n +2) x + cos (n +1) x cos (n +2) x = cos x

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  11. cos ((3pi)/( 4) + x) - cos((3pi)/( 4) -x) =- sqrt2 sin x

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  12. sin ^(2) 6x - sin ^(2) 4x = sin 2x sin 10x

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  13. cos ^(2) 2x -cos ^(2) 6x = sin 4x sin 8x

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  14. sin 2 x + 2 sin 4x + sin 6x = 4 cos ^(2) x sin 4x

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  15. cot 4x (sin 5x + sin 3x) = cot x (sin 5x - sin 3x)

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  16. (cos 9x - cos 5x )/( sin 17 x- sin 3x )=- (sin 2x)/( cos 10x )

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  17. (sin 5x + sin 3x )/( cos 5x + cos 3x ) = tan 4x

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  18. (sin x - sin y)/( cos x + cos y) = tan ""(x-y)/(2)

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  19. (sin x + sin 3x )/( cos x + cos 3x )= tan 2x

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  20. (sin x - sin 3x)/( sin ^(2) x - cos ^(2) x) = 2 sin x

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