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April 1, 2015

April 1, 2015

Posted by **Kavya** on Sunday, June 8, 2014 at 11:01pm.

- Maths, Divine International Public School -
**Reiny**, Sunday, June 8, 2014 at 11:45pmcotA = 8/15

tanA = 15/8

so y=15, x=8

r^2 = 15^2 + 8^2

r = √289 = 17

sinA = 15/17

cosA = 8/17

then (1+SinA)(1-SinA)/(1+CosA)(1-CosA)

= (1 - sin^2 A)/(1 - cos^2 A)

= (1 - 225/289)/(1 - 64/289)

= (64/289) / (225/289)

= 64/225

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