Practicing Success
Practicing Success
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If sin θ + sin2 θ = 1; then cos2 θ + cos4 θ is equal to? |
1 0 2 \(\frac{\sqrt {3 } - 2}{2}\) |
1 |
sin θ + sin2 θ = 1 ⇒ sin θ = 1 - sin2 θ ⇒ sin θ = cos2 θ Thus, cos2 θ + cos4 θ = sin θ + (sin θ)2 = sin θ + sin2 θ = 1 |
