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Prove that sin 780^(@) sin 480^(@)+cos24...

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

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Prove that sin750^(@)cos480^(@)+cos120^(@)cos60^(@)=(-1)/2

sin 120^(@) cos 150^(@)- cos 240^(@) sin 330^(@) =

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Prove that (sin70^(@)-cos40^(@))/(cos50^(@)-sin20^(@)) = 1/(sqrt(3)) .

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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-TRIGONOMETRIC RATIOS UPTO TRANSFORMATIONS-EXERCISE - 6(A)
  1. If sin alpha + "cosec" alpha = 2, find value of sin^(n) alpha + "cosec...

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  2. If sec theta + tan theta =5, then find sin theta and determine the qu...

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

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  4. Show that cot.(pi)/(20). cot .(3pi)/(20). cot.(5pi)/(20). cot .(7pi)...

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  5. Simplify. (sigmatauv(-(11pi)/3)taualphav((35pi)/6)sigmaepsilonchi(-(...

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

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  7. If alpha , beta are complementry angles such that bsin alpha = a, the ...

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  8. If cos A = cos B = -1/2 and A does not lie in the second quadrant and ...

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  9. If 8 tan A = -15 and 25 sin B = -7 and neither A nor B is in the four...

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  10. If A, B, C, D are angles of a cyclic quadrilateral then P.T sin A - s...

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  11. If A,B,C,D are the angles of a cyclic quadrilateral then cos A + cos...

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

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  13. If tan^(2)theta = (1-e^2) show that sec theta + tan^(3). "cosec" theta...

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  14. Prove the following. (1+cottheta-cosectheta)(1+tantheta+sectheta)=2.

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  15. కింది వాటిని నిరూపించంది. 3(sin theta - cos theta)^(4) + 6(sin theta +...

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  16. కింది వాటిని నిరూపించంది. (sin theta + cosec theta)^(2) + (cos theta +...

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  17. కింది వాటిని నిరూపించంది.(cos^(4) alpha + 2cos^(2) alpha [1- 1/sec^(2)...

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  18. కింది వాటిని నిరూపించంది.(1+ sin theta - costheta)^(2)/(1+ sin theta +...

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  19. If (2sigmatauvtheta)/((1+chiosigmatheta+sigmatauvtheta)=x, then find t...

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  20. Eliminating theta from the following (i) x = a cos^(3) theta " " y...

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