यदि cos A=4/5 और cosB = 12/13 तो, co...

यदि `cos A=4/5` और `cosB = 12/13` तो, `cos (A+B) ` और ` sin(A+B)` के मान ज्ञात कीजिए जबकि ` (3pi)/2 lt A , B lt 2pi`

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