Answer please.. Its urgent
Attachments:
Answers
Answered by
1
cos2 25 +cos2 65=1
cos2 25+sin2 25=1(trignometric identity
cos2 25+sin2 25=1(trignometric identity
Answered by
1
Hi ,
We know that ,
1 ) cos ( 90° - A ) = sin A
2 ) sin² A + cos² A = 1
Now ,
LHS =Cos² 25 + cos² 65°
= Cos² ( 90 - 65 ) + cos² 65°
= Sin² 65° + cos² 65°
= 1
= RHS
I hope this helps you.
:)
We know that ,
1 ) cos ( 90° - A ) = sin A
2 ) sin² A + cos² A = 1
Now ,
LHS =Cos² 25 + cos² 65°
= Cos² ( 90 - 65 ) + cos² 65°
= Sin² 65° + cos² 65°
= 1
= RHS
I hope this helps you.
:)
Similar questions