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Show that : 2tan^(2)60^(@)-6(sin^(2)45^(...

Show that : `2tan^(2)60^(@)-6(sin^(2)45^(@)-tan^(2)30^(@))=5`

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Show that : cos^(2)60^(@)-sin^(2)60^(@)=-sin30^(@)

Evaluate: cos^(2)25^(@)-sin^(2)65^(@)-tan^(2)45^(@)

Find the value of : tan^(2)30^(@)+tan^(2)45^(@)+tan^(2)60^(@)

Show that: 2(cos^2 45°+tan^2 60°)-6(sin^2 45°-tan^2 30°)=6 (ii) 2(cos^4 60°+sin^4 30°)-(tan^2 60°+cot^2 45°)+3sec^2 30°=1/4

Evaluate : (sin^(2)30^(@)+sin^(2)45^(@)-4cot^(2)60^(@))/(2sin30^(@)cos30^(@)+(1)/(2)tan60^(@))

Prove that : tan(2 times 30^(@))=(2tan30^(@))/(1-tan^(2)30^(@))

Prove that : tan(2 times 30^(@))=(2tan30^(@))/(1-tan^(2)30^(@))

Verify that cos 60^(@)=(1-tan^(2)30^(@))/(1+tan^(2)30^(@))

Find the value of : cos^(2)60^(@)+sec^(2)30^(@)+tan^(2)45^(@)

Find the value of : cos^(2)60^(@)+sec^(2)30^(@)+tan^(2)45^(@)

NAGEEN PRAKASHAN ENGLISH-INTRODUCTION TO TRIGONOMETRY-Exercise 8 B
  1. Find the vlaue of (2tan30^(@))/(1-tan^(2) 30^(@)).

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  2. Find the value of 2sin30^(@)cos30^(@).

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  3. Show that : 2tan^(2)60^(@)-6(sin^(2)45^(@)-tan^(2)30^(@))=5

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  4. Find the vlaue of 4sin^(2)30^(@)+tan^(2)60^(@)+sec^(2)45^(@).

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  5. Find the value of (sin30^(@))/(cos^(2)45^(@))-tan^(2)60^(@)+3cos90^(@)...

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  6. Evaluate : (sin^(2)30^(@)+sin^(2)45^(@)-4cot^(2)60^(@))/(2sin30^(@)cos...

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  7. (2tan3 0^(@))/(1-tan^2 3 0^(@))

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  8. Show that : cos^(2)60^(@)-sin^(2)60^(@)=-sin30^(@)

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  9. (2tan3 0^(@))/(1-tan^2 3 0^(@))

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  10. Show that : cos30^(@)=sqrt((1+cos60^(@))/(2))

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  11. Evaluate : (tan45^(@))/(2sin30^(@)-cos60^(@))

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  12. If A=30^@ verify that cos3A=4cos^3A-3cosA

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  13. If A =45^(@),then show that : cos 2A=cos^(2)A-sin^(2)A

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  14. Given A=60^(@) and B=30^(@), prove that : cos(A+B)=cosAcosB-sinAsinB

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  15. If A =30^(@),then show that : tan2A=(2tanA)/(1-tan^(2)A)

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  16. If tanA=1,then find the value of sin^(2)A+cos^(2)A+cotA.

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  17. If costheta=(sqrt(3))/(3), then find the value of sin3theta.

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  18. If tan(A+B)=sqrt(3)andsin(A-B)=(1)/(2),then find the value of tan (2A-...

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  19. If cos(A+B)=0andsin(A-B)=(sqrt(3))/(2)then find the value of tan(A-3B)...

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  20. If A+B=90^(@)andtanA=sqrt(3), then find the value of B.

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