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Sintheta(1+tantheta)+costheta(1+cottheta)=sectheta+costheta

Sintheta(1+tantheta)+costheta(1+cottheta)=sectheta+costheta

Grade:10

1 Answers

Arun
25763 Points
4 years ago
sin θ ( 1 + tan θ ) + cos θ ( 1 + cot θ ) 

sin θ ( 1 + sin θ / cos θ ) + cos θ ( 1 + cos θ / sin θ ) 

sin θ ( cos θ + sin θ ) / cos θ + cos θ ( sin θ + cos θ ) / sin θ 

( cos θ + sin θ ) ( tan θ + cot θ ) 

( cos θ + sin θ ) ( sin² θ + cos²θ ) / ( sin θ cos θ ) 

( cos θ + sin θ ) / ( sin θ cos θ ) since sin² θ + cos²θ = 1 

[ cos θ / ( sin θ cos θ ) ] + [ sin θ / ( sin θ cos θ ) ] 

1 / sin θ + 1 / cos θ 

cosec θ + sec θ

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