.If sin θ + sin² θ = 1, then cos² θ + cos θ = ..
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Given, sin θ + sin² θ = 1
=> sin θ = 1 - sin² θ = cos² θ
Therefore, cos² θ + cos θ = cos² θ( 1 + cos² θ )
= sin θ( 1 + sin θ )
= sin θ + sin² θ
= 1
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