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

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

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VK GLOBAL PUBLICATION-INTRODUCTION TO TRIGONOMETRY-SHORT ANSWER QUESTIONS-II
  1. (2sin68^(@))/(cos22^(@))-(2cot15^(@))/(5tan75^(@))-(3tan45^(@).tan20^(...

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  2. (sin^(2) 20^(@) + sin^(2) 70^(@))/(cos^(2) 20^(@) + cos^(2) 70^(@)) + ...

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

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  4. Without using tables, evaluate the following: 3 cos 68^(@) . "cosec"...

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  5. If sin 3 theta = cso ( theta - 6^(@)) where 3 theta and theta - 6^(@) ...

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  6. If sectheta=x+1/(4x),p rov et h a t :sectheta+tantheta=2xor ,1/(2x)

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  7. Find an acute angle theta , when (costheta-sintheta)/(costheta+sinthet...

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  8. The altitude A D of a A B C , in which /A obtuse and, A D=10c mdot If...

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  9. If cos e c\ theta=(13)/(12) , find the value of (2sintheta-3\ cos\ ...

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  10. Prove that (tan A )/(1 + sec A) - (tan A )/(1 - sec A ) = 2 cosec A.

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  11. Prove: (cos^(3)theta+sin^(3)theta)/(cos theta+sin theta)+(cos^(3)theta...

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  12. सिद्ध करें कि cot theta-tan theta=(2 cos^(2)theta-1)/(sin theta*cos...

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  13. Prove that (cot^(2)theta)/(cosec theta+1)=cosec theta-1

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  14. Evaluate the (sin 30^(@) + tan 45^(@) - "cosec" 60^(@))/(sec 30^(@)...

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  15. Evaluate the following (i) s in"\ "60o"\ "cos"\ "30o"\ "+"\ "s in"...

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  16. If tan(A+B)=sqrt(3) and t a n(A B)=1/(sqrt(3)); 0o<A+Blt=90o;""...

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  17. If A, B and C are interior angles of a triangle ABC, then show that si...

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  18. Prove that (cosec theta-cot theta)^2=(1-cos theta)/(1+cos theta)

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  19. Prove that: (sin theta - 2 sin^(3) theta) = (2cos^(3) theta - cos the...

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  20. (sin A+cosec A)^(2)+(cos A+sec A)^(2)=7+tan^(2)A+cot^(2)A

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