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Show that cos^(2)""(pi)/(10)+cos^(2)""(4...

Show that `cos^(2)""(pi)/(10)+cos^(2)""(4pi)/(10)+cos^(2)""(6pi)/10+cos^(2)""(9pi)/10=2`.

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SRISIRI PUBLICATION-IPE SCANNER (TEXUAL BITS)-Very Short Questions (2 marks) (Trigonometric Ratios, Transformations)
  1. Show that cot.(pi)/(20). cot .(3pi)/(20). cot.(5pi)/(20). cot .(7pi)...

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  2. Find the value of sin^(2)""(pi)/(10)+sin^(2)""(4pi)/(10)+sin^(2)""(6pi...

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  3. Show that cos^(2)""(pi)/(10)+cos^(2)""(4pi)/(10)+cos^(2)""(6pi)/10+cos...

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  4. Evaluate cos^(2)45^(@)+cos^(2)135^(@)+cos^(2)225^(@)+cos^(2)315^(@).

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  6. If tan20^(@)=p then prove that = (tan610^(@)+tan700^(@))/(tan 560^(@)-...

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  7. If "sec" theta + tan theta = 2//3, then find the value of sin theta an...

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  8. If "sec" theta + tan theta = 5 then find sin theta and determine the q...

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  9. If cosec theta + cot theta =1//3, then find cos theta and determine th...

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  10. If acos theta -bsin theta =c, then show that asine theta + bcos =pm s...

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  11. If 3sin A + 5 cos A = 5, then show that 5 sin A - 3 cos A = +- 3.

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  12. If 3sin A + 4 cos A = 5, then find the value of 4 sin theta - 3 cos th...

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  14. Find the value of sin 330^(@) .cos 120^(@) + cos 210^(@) . Sin 300^(@)...

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  15. Simplify cos 100^(@) cos 40^(@) + sin 100^(@) sin 40^(@).

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  16. Show that sin 750 ^(@) cos 480^(@) + cos 120 ^(@) cos 60 ^(@)=-1/2

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  17. Prove that sin 780^(@) sin 480^(@)+cos240^(@). Cos300^(@) = 1/2

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  18. Find the value of tan56^(@)-tan11^(@)-tan56^(@).tan11^(@).

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  19. Prove that tan70^(@)-tan20^(@)=2tan50^(@).

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  20. Prove that tan72^(@)=tan18^(@)+2tan54^(@).

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