Given:
cos² (270 - ∅) – sin² (180 - ∅) + sin² (π/2) sin² (270 - ∅)
Formula Used:
cos² (270 - ∅) =sin² ( ∅)
sin² (180 - ∅)=sin² ( ∅)
sin² (π/2) =1
sin² (270 - ∅) =cos² ( ∅)
Solution:
cos² (270 - ∅) – sin² (180 - ∅) + sin² (π/2) sin² (270 - ∅)
= sin² ( ∅) -sin² ( ∅) +1.cos² ( ∅)
=cos² ( ∅)
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