if sin A.cos A = k then sinA+cosA =?
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Step-by-step explanation:
sin A.cos A =k
multiply both side -2
2 sinA.cosA=2k
add 1 both side
1+2sinA.cosA=2k+1
1= sin²x+cos²x
(sinA+cosA)²= 2k+1
sinA+cosA= (2k+1)½
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