anonymous
  • anonymous
cos(2y)cos(y) - sin(2y)sin(y)
Trigonometry
jamiebookeater
  • jamiebookeater
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dan815
  • dan815
http://www.maths.manchester.ac.uk/~cds/internal/tables/trig.pdf
dan815
  • dan815
try some other trig identities in there if that doesnt simplify it
anonymous
  • anonymous
so would it be cos2A * sin2A - 2 sinA * cosA?

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dan815
  • dan815
it will simplify to cos(3y)
anonymous
  • anonymous
just plug it in ur calc matway.com is a great one .... cos(3y)
dan815
  • dan815
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anonymous
  • anonymous
thanks

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