问题
填空题
sin15°sin75°的值是______.
答案
∵sin15°sin75°
=sin15°cos15°
=
sin30°1 2
=
.1 4
∴sin15°sin75°的值是
.1 4
故填:
.1 4
sin15°sin75°的值是______.
∵sin15°sin75°
=sin15°cos15°
=
sin30°1 2
=
.1 4
∴sin15°sin75°的值是
.1 4
故填:
.1 4