Question

in a triangle abc angle B = 90 degrees BC plus AB equals to 17 cm BC - AB equals to 7 cm then find sin a and Cos c

Answer 1

This the required answer
Hope it helps u..

Answer 2

$let \: bc = x\: \: \: \: \: \: \: ab = y \\ x + y = 17 \: \: \: and\: \: x - y = 7 \\ x = 12 \: \: \: \: \: \: and \: \: y = 5 \\ ac = \sqrt{ {x}^{2} + {y}^{2} } = \sqrt{144 + 25} = \sqrt{169} = 13 \\ \sin(a) = \frac{bc}{ac} = \frac{12}{13} \\ \cos(c) = \frac{bc}{ac} = \frac{12}{13}$