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SUBHASH PUBLICATION-TRIGONOMETRY-Prove the following
- (sin3A)/(sinA)-(cos3A)/(cosA)=2
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- Prove that (sin 3 theta)/(1+2cos2 theta)=sin theta and hence find sin1...
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- cos4x=1-8sin^(2)x cos^(2) x
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- Prove that : sin3x=3sinx-4sin^(3)x
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- Prove that: cos3x=4cos^(3)x-3cosx
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- Show that : cos130^(@)+cos110^(@)+cos10^(@)=0
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- Show that: (sinA-sinB)/(sinA+sinB)=tan((A-B)/2).cot((A+B)/2)
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- (cos 75^(@)+cos15^(@))/(sin75^(@)-sin 15^(@))=sqrt(3)
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- (sin6A+sin2A+2sin4A)/(sin7A+sin3A+2sin5A)=(sin4A)/(sin5A)
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- Prove that : cosA+cos(120^(@)-A)+cos(120^(@)+A)=0
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- cos^(2)theta+cos^(2)(60^(@)+theta)+cos^(2)(60^(@)-theta)=3/2
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- Show that:4sinA.sin(60^(@)+A)sin(60^(@)-A)=sin3A
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- If A+B+C=pi, Prove that tanA+tanB+tanC=tanA.tanB.tanC
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- cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16
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- If A+B+C=pi prove that "tan"A/2"tan"B/2+"tan"B/2"tan"C/2+"tan"C/2"tan"...
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- If A+B+C=pi, prove that sin 2A+sin 2B+sin 2C=4 sinA sin B sinC.
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- Prove that: sinA+sinB+sinC=4cos(A/2)cos(B/2)cos(C/2) if A + B +C =180 ...
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- cos^(2)A+cos^(2)B-cos^(2)C=1-2sinA sinB cosC
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- In DeltaABC, prove that (sin(B-C))/(sin(B+C))=(b^(2)-c^(2))/(a^(2))
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- (a^(2)-b^(2))/(c^(2)-a^(2))=c/b . (sin(A-B))/(sin(C-A))
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