Question

A triangle abc and the angle c is 90degree then find cos(a+b)

Answer 1

HOLA

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We know that sum of a triangle is 180°

Here , C = 90

So , 180 - 90 = 90

So the needed angle is 90 which can be only given by A and B

So , Cos ( A + B ) = 90°

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HOPE U UNDERSTAND ❤❤❤