If \(\sin 48.59^\circ = 0.75\), then \(\cos 138.59^\circ =\) ?

cos ( 138.49 ) = cos ( 90 − ( − 48.59 )) = − s in ( 48.59 ) = − 0.75

Answered by madankapoor10 | 2024-06-10

Using co-function identities, cos ( 138.5 9 ∘ ) can be expressed as − cos ( 41.4 1 ∘ ) , which is equal to − sin ( 48.5 9 ∘ ) . Given that sin ( 48.5 9 ∘ ) = 0.75 , we find that cos ( 138.5 9 ∘ ) = − 0.75 .
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Answered by madankapoor10 | 2024-12-24