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Evaluate the following : (sin72^(@)+co...

Evaluate the following :
`(sin72^(@)+cos18^(@))(sin72^(@)-cos18^(@))`

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KUMAR PRAKASHAN-INTRODUCTION TO TRIGONOMETRY-Test Your Skills
  1. If A and B are acute angles such that tanA=1/2,tanB=1/3 and tan(A+B)=(...

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  2. Evaluate the following : (tan35^(@))/(cot55^(@))+(cot78^(@))/(tan12^...

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  3. Evaluate the following : (sin72^(@)+cos18^(@))(sin72^(@)-cos18^(@))

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  4. Evaluate the following : sec50^(@)sin40^(@)+cos40^(@)cosec50^(@)

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  5. Express each of the following in terms of trigonometric ratios of ang...

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  6. Express each of the following in terms of trigonometric ratios of ang...

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  7. Express each of the following in terms of trigonometric ratios of ang...

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  8. Prove that : tan 20° tan 35° tan 45° tan 55° tan 70° = 1

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  9. Prove that : (cos80^(@))/(sin10^(@))+cos59^(@)cosec31^(@)=2

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  10. If sin theta = cos (theta-45°), where theta and theta- 45° are acute a...

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  11. Evaluate : ( 1 ) cosec (65° +theta) -sec (25° - theta) - tan (55° + ...

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  12. Express all the other trigonometric ratios of angleA in terms of sin ...

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  13. If sintheta=1/3 find the value of 2cot^(2)theta+2.

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  14. Evaluate : 2(sin^(6)theta+cos^(6)theta)-3(sin^(4)theta+cos^(4)theta)...

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  15. Prove the following identities : sec^(2)theta-cos^(2)theta=sin^(2)th...

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  16. Prove the following identities : ((1+tan^(2)A)cotA)/(cosec^(2)A)=tan...

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  17. Prove the following identities : 1/( sectheta-tantheta)-1/(costheta)...

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  18. Prove the following identities : (sintheta-costheta+1)/(sintheta+cos...

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  19. Prove the following identities : (tanA)/(secA-1)+(tanA)/(secA+1)=2co...

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  20. Prove the following identities : (cottheta+cosectheta-1)/(cottheta-c...

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