Help needed on these two problems - 1. Prove that tan^(-1) x = sin^(-1)( x / sqrt(1 + x^2)) 2. Find the exact value of -
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Originally Posted by darkangel Help needed on these two problems - 1. Prove that tan^(-1) x = sin^(-1)( x / sqrt(1 + x^2)) 2. Find the exact value of - for the second one rewrite it as ..then split it apart using and use the fact that to finish
The second one should be easy.
1. Set . This implies: Using the identity: So, find an expression of . Then, find tan y using the relation: and solve for y.
aite Thanks for everyone's help
Originally Posted by galactus Just a quick note here. Observe that so and the result follows.
woah ! thanks Krizalid !!
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