Commit 94990bf

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Updates from pull request #4

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Original file line number	Diff line number	Diff line change
`@@ -4,6 +4,9 @@`
`4`	`4`	`#include <cmath>`
`5`	`5`	`using namespace std;`
`6`	`6`
	`7`	+// Note: currently, not all compilers mark `acos` as a
	`8`	`+// constexpr function in cmath. The following line might`
	`9`	+// not compile with `clang++` for example.
`7`	`10`	`constexpr double PI1 = acos(-1.0);`
`8`	`11`	`constexpr double PI2 = 22.0 / 7.0;`
`9`	`12`

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Original file line number	Diff line number	Diff line change
`@@ -3,6 +3,9 @@`
`3`	`3`	`import std;`
`4`	`4`	`using namespace std;`
`5`	`5`
	`6`	+// Note: currently, not all compilers mark `acos` as a
	`7`	`+// constexpr function in cmath. The following line might`
	`8`	+// not compile with `clang++` for example.
`6`	`9`	`constexpr double PI1 = acos(-1.0);`
`7`	`10`	`constexpr double PI2 = 22.0 / 7.0;`
`8`	`11`

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