sin2A+sin2B+sin2C=4cosA.cosB.sinC
Manish Tiwari , 11 Years ago
Grade 6
Trigonometry> sin2A+sin2B+sin2C=4cosA.cosB.sinC...
1 Answers
purva
Last Activity: 11 Years ago
Use A+B+C=Pi Then use sin2A+sin2B=2sin(A+B)cos(A-B) by this I m gettin the final ans =4sinAsinBsinC
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