化简:(根号1+100°)-(根号1-100°)

问题描述:

化简:(根号1+100°)-(根号1-100°)
化简(根号1+sin100°)-(根号1-sin100°)

是根号(1+sin100°)-根号(1-sin100°)吧?
根号(1+sin100°)-根号(1-sin100°)
=根号[ sin^2 (50°)+cos^2 (50°)+2sin50°cos50° ]-根号[ sin^2 (50°)+cos^2 (50°)-2sin50°cos50° ]
=sin50°+cos50°-(sin50°-cos50°)
=2cos50°