Posted by **Anonymous** on Tuesday, January 31, 2012 at 10:05pm.

How can I find the exact value of 4cos(7ð/4)-2sin(ð/3)?

- trig -
**Anonymous**, Tuesday, January 31, 2012 at 10:19pm
In a graphic calculator punch in cos(7/4) and should give you the right answer

subtract it from sin(0/3)

and tada!

- trig -
**Anonymous**, Tuesday, January 31, 2012 at 10:34pm
the weird symbol is suppose to be pi (3.14...) not a zero. it got messed up after submitting the question

- trig -
**Anonymous**, Tuesday, January 31, 2012 at 10:35pm
need to show my work

- trig -
**Reiny**, Wednesday, February 1, 2012 at 8:31am
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

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