Asked by Anonymous
5cosA+3=0 and180<A<360, without using a calculator and with the aid of diagram, determine the value of SinA+ cosA
Answers
Answered by
oobleck
A is in QIII or QIV
cosA = -3/5 so A is in QIII, and
x = -3
r = 5
y = -4
sinA = y/r = -4/5
sinA + cosA = -4/5 - 3/5 = -7/5
cosA = -3/5 so A is in QIII, and
x = -3
r = 5
y = -4
sinA = y/r = -4/5
sinA + cosA = -4/5 - 3/5 = -7/5
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