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anonymous
 one year ago
what are the steps I need to take to answer these questions
Find the exact value of each expression. Do not use calculator
cos(sin^1(3/5))
and
Find exact value of the expression
sin(cos^1 (5/13)cos^1 (4/5))
anonymous
 one year ago
what are the steps I need to take to answer these questions Find the exact value of each expression. Do not use calculator cos(sin^1(3/5)) and Find exact value of the expression sin(cos^1 (5/13)cos^1 (4/5))

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freckles
 one year ago
Best ResponseYou've already chosen the best response.1you could let u=arcsin(3/5) so sin(u)=3/5 and you are trying to find cos(u) given sin(u)=3/5 dw:1436832595334:dw

freckles
 one year ago
Best ResponseYou've already chosen the best response.1that one thing is suppose to be u

freckles
 one year ago
Best ResponseYou've already chosen the best response.1the second one I would expand and make two right triangles

freckles
 one year ago
Best ResponseYou've already chosen the best response.1expand using: \[\sin(ab)=\sin(a)\cos(b)\sin(b)\cos(a)\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so would cos u =4/5 for the first one?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0cool :) can you show me how to set up the second one I'm a little confused on how it would look like

freckles
 one year ago
Best ResponseYou've already chosen the best response.1my thing isn't notifying me when people reply \[\sin(ab)=\sin(a)\cos(b)\sin(b)\cos(a) \\ \text{ where } a=\arccos(\frac{5}{13}) \text{ and } b=\arccos(\frac{4}{5} ) \\ \text{ so } \cos(a)=\frac{5}{13} \text{ and } \cos(b)=\frac{4}{5}\] find sin(a) and cos(b) in a similar way you did for the previous question
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