if A+B+C=180 prove that sin2A+cosA sinB SinC =1+cosA cosB cosC

Question

Question

if A+B+C=180

prove that

sin²A+cosA sinB SinC =1+cosA cosB cosC

Answer 1

Answer #1

++ B given A+B + C = 180° we have to proof, sinta &cOSAS InBsInC = +COSACOSB cose = COSASINBsinc- cos ACOSBLose = 1- SINA COS

Answer 2

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