Monday, July 6, 2015

prove that: sinA/tanA + cosA = 2cosA

sinA / tanA + cosA = 2cosA


We
will start from the left side:


We know that tanA =
sinA/cosA


Now
substitute:


sinA/ tanA + cosA = sinA/(sinA/cosA)  +
cosA


                             = (sinA*cosA / sinA)   +
cosA


                             = cosA +
cosA


                              =
2cosA


==> sinA/tanA + cosA =
2cosA

at

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