pliz help me this number

[Aaron de256]

Given that tanφ -3 = 0 evaluate, 4 sinφ -2cosφ Without using tables or calculators if φ lies between 180° and 270°

 

[Deleted member 4993]

Given that tanφ -3 = 0 evaluate, 4 sinφ -2cosφ Without using tables or calculators if φ lies between 180° and 270°

One of the way: Hint:

tan ^2(x) = sec^2(x) - 1...... Continue

 

[Dr.Peterson]

Given that tanφ -3 = 0 evaluate, 4 sinφ -2cosφ Without using tables or calculators if φ lies between 180° and 270°

Another approach: Sketch the reference triangle for this angle, and use it to find the values of sinφ and cosφ.