If sinθ -cosθ = 0, then the value of ( sinθ+ cosθ) is _____?
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⇒ Given:
⇒ 4 = (cos θ) (1 - sinθ) + (cos θ) (1 + sinθ)/1 - sin2 θ)
⇒ 4 = (cos θ - sinθcosθ + cos θ + sinθcos θ)/cos 2 θ
⇒ 4 = 2cos θ/cos 2 θ
⇒ 4 = 2sec θ
⇒ sec θ = 2
∴ θ = 60°
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