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Standard Values of Trigonometric Ratios

Evaluate: 1 S...

Question

Evaluate:1) Sin135cos145+cos135sin145

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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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