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  • 20-10-2016
  • Mathematics
contestada

simplify cos(θ) − sec(θ) /
sin(θ)

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HeavenlyHelper
HeavenlyHelper HeavenlyHelper
  • 20-10-2016
Replace tan θ with sin θ/cos θ

= sin²θ/cos θ + cos θ

Now multiply the right-hand side by cos θ/cos θ to get the same denominator:

= sin²θ/cos θ + cos²θ/cos θ
= (sin²θ + cos²θ)/cos θ

The numerator is equivalent to 1:

= 1 / cos θ
= sec θ

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