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anonymous
 5 years ago
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°)
anonymous
 5 years ago
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°)

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Know that cos(x)=sin(90x) likewise sin(x)=cos(90x)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ya I got that.... just don't know where to go from there

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so just change sin() into cos()

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ok but thats still not one of the choices for an answer

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0cos(70)cos(65)cos(20)cos(35)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0When 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
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