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If a^2sec^2alpha-b^2tan^2alpha=c^2 show ...

If `a^2sec^2alpha-b^2tan^2alpha=c^2` show that, `sinalpha=pm sqrt((c^2-a^2)/(c^2-b^2)).`

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CHHAYA PUBLICATION-TRIGONOMETRIC RATIOS [OR FUNCTIONS] OF POSITIVE ACUTE ANGLES-EXERCISE 2
  1. If 4xsec A =1+4x^2 , prove that, sec A +tan A=2xor,1/(2x).

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  2. If tan ^2theta=1-e^2 , prove that, sectheta+tan^3thetacosec theta=(2-e...

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  3. If a^2sec^2alpha-b^2tan^2alpha=c^2 show that, sinalpha=pm sqrt((c^2-a^...

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  4. If sin^4theta+sin^2 theta=1 show that, tan^4theta-tan^2theta=1 .

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  5. If tan^4theta+tan^2theta=1 , prove that, cos^4 theta+cos^2theta=1

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  6. If sin^2theta=cos^3theta prove that, cot^6theta-cot^2theta=1 .

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  7. If sin theta+sin^2theta=1 , show that cos^4theta+cos^2theta=1.

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  8. If cos theta -sin theta =sqrt(2) sin theta , show that, costheta+sinth...

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  9. If un=sin ^n alpha+cos^nalpha then show that, the value of 6u4-4u6 is...

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  10. Find the principal value of cos^-1(-1/2)

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  11. Eliminate theta in each of the following : x=asec theta, y=btan the...

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  12. Eliminate theta in each of the following : a sin theta=p, btan the...

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  13. Eliminate theta in each of the following : sin theta+cos theta=m, t...

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  14. Eliminate theta in each of the following : sintheta -cos theta=a, ...

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  15. If 7sin ^2theta +3cos^2theta =4, prove that, tan theta =pm1/sqrt(3) .

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  16. Find the minimum value of cos^4 theta+sin^2 theta.

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  17. If p tan theta=tan p theta , show that, (sin^2p theta)/(sin^2theta)=(p...

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  18. If (1+sin alpha)(1+sinbeta)(1+singamma)=(1-sinalpha)(1-sinbeta)(1-sing...

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  19. If (cosecalpha-1)(cosecbeta-1)(cosecgamma-1)=(cosecalpha+1)(cosecbeta+...

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  20. Eliminate theta each of the following : l1cos theta+m1sin theta+n1=0...

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