You can see the formula on this Wikipedia page (starting with "More generally..."). In those notations, a = 7, b = 5 and . The number . In my calculations, and , so the answer is (this needs double-checking).
hi guys new here, looking for help and advice and here to help others.
Currently studying maths in engineering
Looking at a question as follows:
Two are: 7sin vt and 5sin(vt + p/4)
Use phasors and calculation to combine the two functions, expressing the result in Rsin (vt + alpha)
This is what I have got
y=5sin (vt + p/4)
y=7sin vt + 5sin (vt + p/4)
co sine rule:
a squared = b squared + c Squared – 2b.cosA
a squared = 5 squared + 7 squared – 2 x 5 x 7 – 0.707
a squared = 74
Am I on the right lines, I am using an example did previus but cant work out where the 0.707 comes from
Help in doing this be great