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Evaluate: (i) (sin^2 63o+sin^2 27o)/(cos...

Evaluate: (i) `(sin^2 63o+sin^2 27o)/(cos^2 17o+cos^2 73o)` (ii) `s in 25o"\ "cos 65o+cos"\ "25os in"\ "65o`

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OSWAL PUBLICATION-INTRODUCTION TO TRIGONOMETRY AND TRIGONOMETRIC IDENTITIES -NCERT CORNER (Textbook Questions) (Exercise - 8.4)
  1. Express the trigonometric ratios sin A, sec A and tan A in terms of ...

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  2. Write all the other trigonometric ratios of /Ain terms of sec A.

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  3. Evaluate: (i) (sin^2 63o+sin^2 27o)/(cos^2 17o+cos^2 73o) (ii) s in 2...

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  4. Evaluate: sin 25^(@) cos 65^(@) + cos 25^(@) sin 65^(@).

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  5. Choose the correct option. 9sec^2A-9tan^2A=

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  6. (1+tan theta+sec theta)(1+cot theta-"cosec "theta) is equal to :

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  7. Choose the correct optioin . Justify your choice. (sec A + tan A) (...

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  8. Choose the correct optioin . Justify your choice. (1+ tan^2A)/(1+co...

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  9. Prove the following identity, where the angles involved are acute a...

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  10. Prove the following identity, where the angles involved are acute ang...

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  11. Prove the following identity, where the angles involved are acute a...

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  12. Prove the following identity, where the angles involved are acute ang...

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  13. Prove that (cot theta + "cosec" theta -1 )/(cot theta - "cosec" thet...

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  14. Prove the following identity, where the angles involved are acute ang...

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  15. Prove the following identities, where the angles involved are acute a...

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  16. Prove the following identity, where the angles involved are acute ang...

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  17. Prove the following identity, where the angles involved are acute ang...

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  18. Prove the following identity, where the angles involved are acute ang...

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