Question

If triangle ABC is a
right angled at c, then
value of cos (A+B) is
С ????

pls ans
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Answer 1

Answer:

Step-by-step explanation: as C is right angle, so , the summation of other angles are (180-90)=90. A+B=90. so, cos(A+B)=cos90°=0.

Hope it's help you

Answer 2

Step-by-step explanation:

If C=90

0

Therefore

cos(A+B)

=cos(180 −C)

=cos(180 −90)

=cos(90)

=0