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Prove the following identity : sin^2 A...

Prove the following identity :
`sin^2 A cos^2 B + cos^2 A sin^2 B + cos^2 A cos^2 B+ sin^2 A sin^2 B = 1`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. Prove the following identity : (sin theta+ cos theta) (sec theta+ co...

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  2. (cosec theta -sin theta) (sec theta - cos theta) (tan theta + cot thet...

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  3. Prove the following identity : sin^2 A cos^2 B + cos^2 A sin^2 B + c...

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  4. Prove the following identity : (sin theta tan theta)/ (1-cos theta)=...

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  5. Prove the following identity : (1+cos theta)/(1-cos theta)= (tan^2 t...

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  6. Prove the following identity : (1-sin theta)/(1+sin theta)= (sec the...

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  7. Prove the following identity : sqrt ((1-cos theta)/(1+cos theta)) = ...

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  8. Prove the following identity : sqrt ((1+cos theta)/ (1-cos theta))=c...

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  9. Prove the following identity : sqrt ((1+sin theta)/ (1-sin theta)) =...

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  10. Prove the following identity : cot^2 theta- cos^2 theta= cot^2 theta...

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  11. Prove the following identity : sin^4 theta+ cos^4 theta= 1-2 sin^2 t...

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  12. Prove the following identity : cos^4 theta- sin^4 theta= cos^2 theta...

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  13. Prove the following identity : sec^4 theta- tan^4 theta =1+2 tan^2 t...

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  14. Prove the following identity : sin^6 theta+ cos^6 theta= 1-3 sin^2 t...

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  15. Prove the following identity : 2 (sin^6 theta+ cos^6 theta)-3 (sin^4...

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  16. Prove the following identity : 2u6-3u4+1=0, where un =cos^n theta+ s...

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  17. Prove the following identity : sec^6 theta- tan^6 theta=1+3 tan^2 th...

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  18. Prove the following identity : cosec^6 theta- cot^6 theta =3 cot^2 t...

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  19. Prove the following identity : 2 sec^2 theta- sec^4 theta-2 cosec^2 ...

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  20. Prove the following identity : (sin theta)/(1+cos theta)+ (tan theta...

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