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If sinalpha+sinbeta=a ,cosalpha+cosbeta=...

If `sinalpha+sinbeta=a ,cosalpha+cosbeta=b=>sin(alpha+beta)`=

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Show that: sin^2 alpha + sin^2 beta + 2sinalpha sinbeta cos(alpha+beta)=sin^2 (alpha+beta)

If the lines x(sinalpha+sinbeta)-ysin(alpha-beta)=3 and x(cosalpha+cosbeta)+ycos(alpha-beta)=5 are perpendicular then sin2alpha+sin2beta is equal to:

If sinalpha+sinbeta=a and cosalpha+cosbeta=b , prove that tan((alpha-beta)/2)=+-sqrt((4-a^2-b^2)/(a^2+b^2)) .

If sinalpha+sinbeta=a and cosalpha+cosbeta=b , prove that tan((alpha-beta)/2)=+-sqrt((4-a^2-b^2)/(a^2+b^2)) .

If sinalpha-sinbeta=a and cosalpha+cosbeta=b then write the value of "cos"(alpha+beta) .

If sinalpha+sinbeta=a and cosalpha+cosbeta=b prove that: cos(alpha-beta)=((a^2+b^2-2)/2)

If sinalpha+sinbeta=a and cosalpha+cosbeta=b prove that: cos(alpha-beta)=((a^2+b^2-2)/2)

Prove by vector metod the following formula of plane trigonometry cos(alpha-beta)=cosalpha cosbeta+sinalpha sinbeta

If sinalpha+sinbeta=a\ and\ cosalpha-cosbeta=b , then tan((alpha-beta)/2)= a. -a/b b. -b/a c. sqrt(a^2+b^2) d. none of these

If sin alpha+sin beta=a\ a n d\ cosalpha+cosbeta=b , show that : sin(alpha+beta)=(2"a b")/(a^2+b^2)

RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS OF MULTIPLE AND SUBMULTIPLE ANGLES-All Questions
  1. Prove:cos(pi/15)cos((2pi)/15)cos((3pi)/15)cos((4pi)/15)cos((5pi)/15)co...

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  2. If sinalpha+sinbeta=a and cosalpha+cosbeta=b prove that: cos(alpha-bet...

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  3. If sinalpha+sinbeta=a ,cosalpha+cosbeta=b=>sin(alpha+beta)=

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  4. Prove that sqrt((1-cos2theta)/(1+cos2theta))=tantheta where tantheta>0

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  5. Prove that: (sin2theta)/(1-cos2theta)=cottheta

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  6. Prove that: (sin2theta)/(1+cos2theta)=t a ntheta

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  7. Prove that: \ sqrt(2+sqrt(2+2cos4theta))=2costheta

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  8. Prove :(1+sin2theta-cos2theta)/(1+sin2theta+cos2theta)=tantheta

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  9. Prove that :(sintheta +sin2theta)/(1+costheta+cos2theta)=tantheta

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  10. Prove that: (cos2theta)/(1+sin2theta)=tan(pi/4-theta)

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  11. Prove that: (costheta)/(1+sintheta)=tan(pi/4-theta/2)

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  12. Prove that: sin^2(pi/8)+sin^2((3pi)/8)+sin^2((5pi)/8)+sin^2((7pi)/8)=2

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  13. Prove that: (cosalpha+cosbeta)^2+(sinalpha+sinbeta)^2=4cos^2\ \ ((alph...

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  14. Prove that: 1+cos^2 2theta=2(cos^4theta+sin^4theta)

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  15. Prove that :cos^3 2theta+3cos2theta=4(cos^6theta-sin^6 theta)

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  16. Prove that : (sin3A+sin A)sin A+(cos3A-cos A)cos A=0

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  17. Prove that:cos^2(pi/4-theta)-sin^2(pi/4-theta)=sin2theta

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  18. Prove that: cos4A=1-8cos^2\ A+8cos^4\ A

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  19. Prove that 3(sinx-cosx)^4+4(sin^6x+cos^6x)+6(sinx+cosx)^2=13

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  20. cos^6A-sin^6A=cos2A(1-1/4sin^2 2A)

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