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SUBHASH PUBLICATION-TRIGONOMETRY-Prove the following
- (cos2A)/(a^(2))-(cos2B)/(b^(2))=1/(a^(2))-1/(b^(2))
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- Sigmaa sin (B-C)=0
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- If a sin a=b sin B then prove that Delta ABC is isosceles.
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- If a cosA=b cos B then prove that Delta ABC is eitherisosceles or righ...
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- In DeltaABC if (cosA)/a=(cosB)/b=(cosC)/c Prove that DeltaAB C is equi...
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- Prove that a^(2)+b^(2)+c^(2)=2(ab cos C +bc cosA +ca cos B)
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- (cosA)/a+(cosB)/b+(cosC)/c=(a^(2)+b^(2)+c^(2))/(2abc)
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- cos theta . Cosec theta = cot theta
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- (1-sin^2A)(1+tan^(2)A)=1
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- (sin theta)/(cosec theta)+(cos theta)/(sec theta)=1
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- tan A . Sin A+ cos A=secA
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- tan A +cotA =secA.cosecA
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- sqrt((1-sinA)/(1+sinA))=secA-tanA
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- cos^(4)A-sin^(4)A=2cos^(2)A-1
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- sin^(6)theta=cos^(6)theta=1-3sin^(2)thetacos^(2)theta
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- (1-cos theta)/(sin theta)=(sin theta)/(1+cos theta)
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- (sin^(2) theta)/(1-cos theta) -(cos^(2) theta)/(1-sin theta)=cos theta...
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- If x=4 cos theta, y=r sin theta Prove that x^(2)+y^(2)=r^(2)
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- (sin x - sin 3x)/(sin^(2)x-cos^(2)x)=2sinx
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- (cos 4x+cos3x+cos2x)/(sin 4x+sin3x+sin2x)=cot3x
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