I'm in year 11 right now and I just had a brief discussion with my maths teacher about function notation in trigonometry.
For a test, I wrote this,
I assumed that would be interpreted as sin(50)*sin(50)
But I was told the correct notation for this is is
I'm curious if that is the 'proper' mathematical convention, or just how things are taught in high schools?
I'm Australian, in case there are some regional differences.
Thanks for the help!