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OpenStudy (anonymous):
Use sum and difference identities to simplify this expression. cos125cos65+sin125sin65 a.sin190 b.cos190 c.sin60 d.cos60
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OpenStudy (anonymous):
this is the subtraction angle formula for cosine
OpenStudy (anonymous):
i.e it is \[\cos(125-65)\]
OpenStudy (anonymous):
thank you i appreciate it.
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