数学 宿題

Suugaku shukudai really get me mad.
Sensei gave us about 10 questions to solve during this summer break.I'm not angry with the quantity.But the answer somehow make me think that "Is this a joke or what?".As my sensei said,it's easy to create a problem.The problem is to solve the problem.Take this question for example:



Now guess the answer?
Answer=1

Another question.
If sinA+sinB=1 and cosA+cosB=1,find the value of
a)sinA+cosA b)sin(A-B)

Answer: a)1 b)+-1


Argh!!
Sensei must be laughing right now.