anonymous
  • anonymous
write the given expression as the cosine of an angle: cos(70°)cos(65°)-sin(70°)sin(65°) a)cos(65°) b)cos(135°) c)cos(5°) d)cos(70°) e)cos(-130°)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Know that cos(x)=sin(90-x) likewise sin(x)=cos(90-x)
anonymous
  • anonymous
ya I got that.... just don't know where to go from there
anonymous
  • anonymous
so just change sin() into cos()

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anonymous
  • anonymous
ok but thats still not one of the choices for an answer
anonymous
  • anonymous
cos(70)cos(65)-cos(20)cos(35)
anonymous
  • anonymous
When you solve this you should get numerical answer of about -.625 Take arcos of this then you will get 128. which is close to 135
anonymous
  • anonymous
ok... thanks

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