Question

cos 60 degree cos 30 degree -sin 60 degree since 30 degree =​

Answer 1

Answer:

cos60×cos30-sin60×sin30= (1/2×root3/2)-root3/2×1/2

= root3/4-root3/4

=0

hope it helps

Answer 2

Answer:

0

Step-by-step explanation:

cos60d.=sin30d.=1/2

cos30d.=sin60d.=_/3/2

now,

1/2×_/3/2-_/3/2×1/2

=_/3/4-_/3/4

=0