SinC±SinD & CosC±CosD

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SinC±SinD || CosC±CosD

For any two real numbers C and D , cosC+cos D=

If (sinA-sinC)/(cosC-cosA)=cotB , then A, B, C are in

If A+B+C=pi , prove that : (cosA)/(sinBsinC) + (cosB)/(sinC sinA) + (cosC)/(sinA sinB) =2 .

If sinA sinB sinC+cosAcosB=1, then the value of sinC is

If A+B+C=pi , prove that : sinA cosB cosC +sinB cosC cosA + sinC cosA cosB = sinA sinB sinC .

If ABCD is a cyclic quadrilateral then what is sinA+sinB-sinC-sinD equal to ?

If A+B+C=pi , prove that : cosA sinB sinC +cosB sinC sinA+cosC sinA sinB=1+cosA cosB cosC .

In a DeltaABC , if a = 18, b = 24, c = 30, find (i) sinA, sinB, sinC (ii) cosA, cosB, cosC

If A+B+C=180 , prove that: sinA+sinB+sinC=4cosA/2cosB/2cosC/2