/**
* @expectedException \DomainException
* @expectedExceptionMessage The tangent of this 'angle' is undefined.
*/
public function testTanPiTwoDiv()
{
$PiDividedByTwo = DecimalConstants::PI()->div(Decimal::fromInteger(2));
$PiDividedByTwo->tan();
}
/**
* Calculates the cosine of this method with the highest possible accuracy
* Note that accuracy is limited by the accuracy of predefined PI;
*
* @param integer $scale
* @return Decimal cos($this)
*/
public function cos($scale = null)
{
// First normalise the number in the [0, 2PI] domain
$x = $this->mod(DecimalConstants::PI()->mul(Decimal::fromString("2")));
// PI has only 32 significant numbers
$scale = $scale === null ? 32 : $scale;
return self::factorialSerie($x, DecimalConstants::one(), function ($i) {
return $i % 2 === 0 ? $i % 4 === 0 ? DecimalConstants::one() : DecimalConstants::negativeOne() : DecimalConstants::zero();
}, $scale);
}
/**
* @expectedException \DomainException
* @expectedExceptionMessage The cotangent of this 'angle' is undefined.
*/
public function testCotanPiDiv()
{
$PI = DecimalConstants::PI();
$PI->cotan();
}
