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Question

 Evaluate:1) Sin135cos145+cos135sin145


Solution

sin(A+B)=ainAcosB+cosAsinB

Sin135cos145+cos135sin145=sin(135+145) from above formula


=sin(280)

=sin(360-80)                   As sin(360-θ)=-sinθ

= -sin(80)

= -0.9848

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