Fix f32::sin_cos and f64::sin_cos examples

[mr4x]

No description provided.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @aturon (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[bluss]

@bors r+ rollup

thank you!

[bors]

📌 Commit c1db18b has been approved by bluss

[bors]

⌛ Testing commit c1db18b with merge 7a20fc0...

[bors]

💔 Test failed - auto-win-gnu-32-opt-rustbuild

[alexcrichton]

@bors: retry

On Sat, Apr 16, 2016 at 7:59 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-win-gnu-32-opt-rustbuild
http://buildbot.rust-lang.org/builders/auto-win-gnu-32-opt-rustbuild/builds/739

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#33022 (comment)