Question #e6ea2

2 Answers
Jim H
Nov 27, 2017

No it will not. #cos120^@ = -sin30^@#

Somebody N.
Nov 27, 2017

No.

Explanation:

Using identity:

#cos(A+B)=cosAcosB-sinAsinB#

#cos(90^@+30^@)=cos(90^@)cos(30^@)-sin(90^@)sin(30^@)#

#cos(90^@+30^@)=(0)*(sqrt(3)/2)-1*sin(30^@)#

#cos(90^@+30^@)=-sin(30^@)#

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