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Prove that (cos3A + sin3A)/(cosA - sin A...

Prove that `(cos3A + sin3A)/(cosA - sin A) = 1+ 2sin 2A`.

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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-TRIGONOMETRIC RATIOS UPTO TRANSFORMATIONS-EXERCISE - 6(D)
  1. If 0 lt A lt pi //4 and cos A = 4//5, then find the values of sin 2...

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  2. For what values of A in the first quardrant, the expression (cot^(3)A-...

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  3. Prove that (cos3A + sin3A)/(cosA - sin A) = 1+ 2sin 2A.

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  4. If theta lies in third Quardrant and Sintheta=(-4)/5. Find the values ...

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  5. If 90^(@) lt theta lt 180^(@) , cos theta =-12//13 , then sin 2 thet...

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  6. (Cos^(3)theta-Cos3theta)/(Costheta)+(Sin^(3)theta+Sin3theta)/(Sintheta...

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  7. Show that CosA=(Cos3A)/(2Cos2A-1). Hence find the value of Cos15^(@)

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  8. Show that sin A= (sin 3A) /(1+2 cos 2A). Hence find the value of sin 1...

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  9. Prove that tanalpha=(sigmatauv2alpha)/(1+chiosigma2alpha) and hence de...

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  10. Show that 1/(sin 10^(@)) - (sqrt(3))/(cos 10^(@)) = 4.

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  11. Prove that sqrt(3)"cosec"20^(@)-"sec"20^(@) =4.

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  12. tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=

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  13. In a Delta ABC, If tan .(A)/(2)=(5)/(6) and tan .(B)/(2) =(20)/(37), ...

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  14. If cos theta =(5)/(13) and 270 ^(@) lt theta lt 360^(@), evaluate sin ...

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  15. If 180^(@) lt theta lt 270^(@) and sintheta=(-4)/5 calculate sin[theta...

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  16. cos^(2) pi/8 + cos^(2) 3pi/8 + cos^(2) 5pi/8 + cos^(2) 7pi/8 =2 అని చూ...

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  17. Show that cos^4""pi/8+cos^4""(3pi)/8+cos^4""(5pi)/8+cos^4""(7pi)/8=3/2

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  18. tan x + tan (x +pi/3) + tan (x +2pi/3) =3 అయితే , tan 3x =1 అని చూపండి...

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  19. Show that sin""(pi)/5.sin""(2pi)/5.sin""(3pi)/5.sin""(4pi)/5=5/16.

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  20. cos^(2)(pi/10) + cos^(2) (2pi/5)+ cos^(2)(3pi/5) + cos^(2)(9pi/10) = 2...

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