public function testAtan() { $this->assertTrue(CMathf::equalsZt(CMathf::atan(0.0), 0.0)); $this->assertTrue(CMathf::equalsZt(CMathf::atan(1.557407725), 1.0)); $this->assertTrue(CMathf::equalsZt(CMathf::atan(0.54630249), 0.5)); $this->assertTrue(CMathf::equalsZt(CMathf::atan(0), 0.0)); }