sin^230°+2sin^260°+tan45°-tan60°+cos^230°=
来源：学生作业帮助网 编辑：六六作业网 时间：2025/01/04 01:02:17
sin^230°+2sin^260°+tan45°-tan60°+cos^230°=sin^230°+2sin^260°+tan45°-tan60°+cos^230°=sin^230°+2sin^26
sin^230°+2sin^260°+tan45°-tan60°+cos^230°=
sin^230°+2sin^260°+tan45°-tan60°+cos^230°=
sin^230°+2sin^260°+tan45°-tan60°+cos^230°=
原式=sin²30°+2sin²60°+tan45°-tan60°+cos²30°
=(1/2)²+2×(√3/2)²+1-√3+(√3/2)²
=1/4+2×3/4+1-√3+3/4
=1/4+3/2+1-√3+3/4
=2+3/2-√3
=(7-2√3)/2
sin^230°+2sin^260°+tan45°-tan60°+cos^230°=
sin²1°+sin²2°+sin²3°+.+sin²89
∫(3 sin t+sin^2 t 分之1) dt .
∫(3 sin t+sin^2t/1) dt
∫(3 sin t+sin^2 t 分之1) dt
∫(3 sin t+sin^2t/1) dt
计算：sin²1°+sin²2°+sin²3°...+sin²45°+sin²46°...+sin²89°
计算：sin²1°+sin²2°+sin²3°+...+sin²87°+sin²88°+sin²89°
sin²1°+sin²2°+sin²3°+……+sin²87°+sin²88°+sin²89°=
sin²1°+sin²2°+sin²3°+...+sin²88°+sin²89°+sin²90°=等于多少?
化简sin^(a-30°)+sin^(a+30°)-sin^a化简sin^2(a-30°)+sin^2(a+30°)-sin^2a
1-2sin 22.5°
1/2-sin^215°
sin²1°+sin²2°+sin²3°……sin²89°=?
sin²1°+sin²2°+sin²3°……sin²89°=
sin²1°+sin²2°+.+sin²89°+sin²90°=?
sin²1°+sin²2°+sin²3°…+sin²89°的值是多少
求值:sin²1°+sin²2°+...+sin²89°+sin²90°=