The equation is .
Acute angle is an angle that is less than 90°
(Apply trigonometry inverse property: )
(2 write as )
(Simplify)
()
The value of .
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"italic](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=a70533f23b0ef1471412c4b54d50800b.png\")
.![\"italic](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=07efc1a82fdd5f162f26a958554aab3f.png\")
(Apply trigonometry inverse property: ![\"y](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=6d5a76206b0bbba8daf3def79042ce6b.png\")
)![\"italic](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=d5f8db118e3a13c48cbe23712c7d9ca0.png\")
(2 write as ![\"square](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=24657ab3e5aeda0b7de627cfd72238a3.png\")
)![\"italic](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=4e688049ffd4dda04c8f3ae89bcd7e0b.png\")
(Simplify)![\"italic](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=d50a26fdbe6c16a4bc5055c56248d2d9.png\")
(![\"italic](\"http://www.wiris.com/demo-aspx/pluginwiris3/fckeditor_wiris/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.aspx?formula=44a559d9e525df1e24f05cae83372b4c.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
.