Question

Evaluate : { cos ( – 750° ) . sin ( -240° ) }
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Answer 1

Answer:

{ cos ( – 750° ) . sin ( -240° ) }

solution,

= { cos ( 750° ) . sin ( -240° ) }

= cos (720°+30°) .{ -sin (270°-30°)}

= cos30°.cos30°

=√3/2.√3/2

= 3/4

hope it helps you