Question
if 5cos A plus 3=0 and 180<A<360..without using a calculator and with the aid of a diagram,determine the value of 1.1 sinA plus cosA 1.2 tanA *sinA
Answers
Steve
5cosA+3 = 0 means that
cosA = -3/5
So, A is in QIII
sinA = y/r = -4/5
sinA+cosA = -4/5 + -3/5 = -7/5
tanA*sinA = 4/3 * -4/5 = -16/15
cosA = -3/5
So, A is in QIII
sinA = y/r = -4/5
sinA+cosA = -4/5 + -3/5 = -7/5
tanA*sinA = 4/3 * -4/5 = -16/15