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anonymous
 5 years ago
find cos(sin1(3/5))
anonymous
 5 years ago
find cos(sin1(3/5))

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Draw a right angled triangle.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0can't you just plug it in your calculator? find the inside function and then put that value into the cos equation?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0no calculator allowed

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yes, you can put it in you calculator... and learn nothing.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0OK so a triangle has an angle (x)  if sin of this angle is 3/5, then one side of the triangle is 3, and the other 5 (by definition). Use pythagoras to work out the other side, and then cos (by definition).

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0x = sin^1(3/5), by the way

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0sin(a) = 3/5 sin^2 + cos^2 = 1 (3/5)^2 + cos^2 = 1 cos^2 = 1  9/25 cos^2 = 16/25 cos(a) = 4/5

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0cos^1(cos(a)) = a, actually ;)

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0hmm..... thats right. lol

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0there aint no simple angles from trig to give you a cosine of 4/5; or a sin of 3/5 :)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the answer is 4/5 right?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yes (but my method was better :p)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0what would cos(sin(3/5)) be?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0That would be .. a lot harder (if neither are ^1)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0sorry cos1(sin(3/5))

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[\cos^{1}\left[\sin\left(\frac{3}{5}\right)\right] = x \iff \sin\left(\frac{3}{5}\right) = \cos(x)\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Are you working in radians or degrees?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0radians i assume. the problem calls for the exact value

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0By definition: \[\sin(\alpha) = \cos\left(\frac{\pi}{2}\alpha\right) \text{ and } \cos(\alpha) = \sin\left(\frac{\pi}{2}\alpha\right) \]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0So if sin(3/5) = cos(x), then x = ....

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0im sorry those formulas are in my book and i can't understand them.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0They aren't in your book, do you mean?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0are. i have example problems i just wanted it broken down.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i have to go. thanks for the bit of help though! sorry i couldn't do more with it

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Oh, OK. Well, they work because cos is just a translation of sin, by pi/2. The answer is x = pi/2  3/5, from the formulae
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