anonymous
  • anonymous
can anyone prove cos(a+b) = cos(a)cos(b)-sin(a)sin(b)
Mathematics
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anonymous
  • anonymous
can anyone prove cos(a+b) = cos(a)cos(b)-sin(a)sin(b)
Mathematics
schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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freckles
  • freckles
what can we use
freckles
  • freckles
like if we should do this from scratch I suggest distance formula... but if we can use other identities this makes the problem a bit easier
jdoe0001
  • jdoe0001
hint: \(\textit{Product to Sum Identities} \\ \quad \\ sin({\color{brown}{ \alpha}})sin({\color{blue}{ \beta}})=\cfrac{1}{2}[cos({\color{brown}{ \alpha}}-{\color{blue}{ \beta}})\quad -\quad cos({\color{brown}{ \alpha}}+{\color{blue}{ \beta}})] \\ \quad \\ cos({\color{brown}{ \alpha}})cos({\color{blue}{ \beta}})=\cfrac{1}{2}[cos({\color{brown}{ \alpha}}-{\color{blue}{ \beta}})\quad +\quad cos({\color{brown}{ \alpha}}+{\color{blue}{ \beta}})]\)

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