trig
posted by Anonymous .
How can I find the exact value of 4cos(7ð/4)2sin(ð/3)?

In a graphic calculator punch in cos(7/4) and should give you the right answer
subtract it from sin(0/3)
and tada! 
the weird symbol is suppose to be pi (3.14...) not a zero. it got messed up after submitting the question

need to show my work

4cos(7π/4)2sin(π/3)
= 4 cos (π/4)  2 sin(π/3)
= 4(√2/2)  2(√3/2)
= (4√2  2√3)/2