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(2sin68^(@))/(cos22^(@))-(2cot15^(@))/(5...

`(2sin68^(@))/(cos22^(@))-(2cot15^(@))/(5tan75^(@))-(3tan45^(@).tan20^(@).tan40^(@).tan50^(@).tan70^(@))/(5)` is equal to

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tan10^(@)-tan50^(@)+tan70^(@)

Evaluate : (2sin68^(0))/(cos22^(0))-(2cot15^(0))/(5tan75^(0))-(3tan45^(0)tan20^(@)tan40^(@)tan50^(@)tan70^(@))/(5)

tan10^(@)-tan50^(@)+tan70^(@)=?

tan20^(@)+2tan50^(@)=

Find tan15^(@).tan25^(@).tan45^(@).tan65^(@).tan75^(@) .

(cot50^(@))/(tan40^(@))

Prove that : (i) (sin 70^@)/(cos 20^@)+(cosec 20^@)/(sec 70^@)-2cos 70^@cosec 20^@=0 (ii) (cos 80^@)/(sin 10^@)+cos 59^@cosec 31^@=2 (iii) (2 sin 68^@)/(cos 22^@)-(2 cot 15^@)/(5 tan 75^@)-(3tan 45^@tan 20^@tan 40^@tan 50^@tan 70^@)/(5)=1 (iv) (sin 18^@)/(cos 72^@)+sqrt(3) (tan 10^@ tan 30^@tan 40^@tan 50^@tan 80^@)=2 (v) (7cos 55^@)/(3 sin 35^@)-(4(cos 70^@cosec 20^@))/(3(tan 5^@tan 25^@tan 45^@tan 65^@tan 856^@))=1

Prove that: tan20^(@)tan40^(@)tan60^(@)tan80^(@)=3

VK GLOBAL PUBLICATION-INTRODUCTION TO TRIGONOMETRY-SHORT ANSWER QUESTIONS-II
  1. Prove the following identities: (1-sintheta)/(1+sintheta)= (sectheta...

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  2. Without using trigonometric tables, evaluate each of the following: (...

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  3. (2sin68^(@))/(cos22^(@))-(2cot15^(@))/(5tan75^(@))-(3tan45^(@).tan20^(...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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