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If A=30 ^(@) then show that sin (A+...

If `A=30 ^(@) ` then show that
` sin (A+ 30 ^(@) ) + cos (A+ 60 ^(@)) = cos A `

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If = 60^(@) and B=30^(@) , then show that : sin A cos B+ cos A sin B= sin (A+B)

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If A=30^(@) , show that : cos2A=cos^(4)A-sin^(4)A

If A=30^(@) , show that : sin3A=4sinAsin(60^(@)-A)sin(60^(@)+A)

If A=30^(@) , show that : 4cosAcos(60^(@)-A)*cos(60^(@)+A)=cos3A

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ICSE-CHAPTERWISE REVISION (STAGE 3) -TRIGONOMETRY
  1. In triangle ABC , angle B = 90 ^(@) , AB = 40 , AC + BC = 80 , Find ...

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  2. If A=30 ^(@) then show that sin ( 60 ^(@) +A) - sin (60 ^(@) - A)...

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  3. If A=30 ^(@) then show that sin (A+ 30 ^(@) ) + cos (A+ 60 ^(@)) ...

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  4. If x= 20 ^(@) Evaluate : 12 sin ""(3x)/( 2) cos 3x + 5 tan (2x+...

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  5. If cot 3x= sin 45^(@) cos 45 ^(@) + cos 60 ^(@) , find the value of ...

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  6. If 2 cos ^(2) theta + sin theta - 2=0 and 0^(@) le theta le 90 ^(@) ...

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  7. In Delta ABC , angle B = 90^(@) find the values of : sin A cos...

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  8. In Delta ABC , angle B = 90^(@) find the values of : cos A cos...

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  9. In an isosceles triangle ABC. AB = BC = 10 cm and BC = 18 cm . Fin...

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  10. In an isosceles triangle ABC. AB = BC = 10 cm and BC = 18 cm . Fi...

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  11. In Triangle ABC, AD is perpendicular to BC, tan B "" = (3)/(4) tan ...

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  12. A balloon is connected to a meteorological station by a cable of lengt...

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  13. ABCD is an isosceles trapezium with AB parallel to DC, AD = BC = 12 cm...

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  14. ABCD is an isosceles trapezium with AB parallel to DC, AD = BC = 12 cm...

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  15. If A,B,C are angles of a triangle, prove that "tan "(B+C)/(2)="cot"...

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  16. If A + B = 90 ^(@) , show that : cos A = sqrt(( cos A)/(sin B) -...

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  17. Prove that : tan (55^(@) + x) = cot (35^(@) - x)

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  18. Prove that : sec (70^(@) - 0) = cosec (20^(@) + 0)

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  19. Prove that : Sin( 28 ^(@) +A) = cos ( 62 ^(@) - A)

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  20. Prove that : (sinthetacos(90^0-theta)costheta)/(sin(90^0-theta))+(cost...

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