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anonymous
 5 years ago
How to find the value of sin[2cos^1(3/5)] without using calculator??
anonymous
 5 years ago
How to find the value of sin[2cos^1(3/5)] without using calculator??

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Let \[\cos^{1}\frac{3}{5} = A \implies \cos A = \frac{3}{5} \implies \cos^2 A = \frac{9}{25}\] \[\cos^2 A + \sin^2 A = 1 \implies \sin A = \sqrt{19/25} = \frac{4}{5} \] We cant to find \[\sin 2A \] which is equal to \[2\sin A \cos A \]. Gogogogogogog

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Anwer is 24/25 and when i use with calculator it gives me that number...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Cool; I did it without a calculator, using the method above, because I'm not a three year old baby.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0So what is your answer at then end of your method?? 4/5??

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ah so just plug 4/5 to the equation i got it thanks

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0No.. The answer is 2 * sin A * cos A. And I told you sin A = 4/5 and cos A = 3/5.
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