Question

5. यदि ΔABC, C पर समकोणी हैं, तो cos (A+ B)
का मान है।
(A)1
(B)0
© ।/2
(D)√3/2
​

Answer 1

Solution:

Given: C=90°

By angle sum property,

A + B + C=180

=>A + B +90=180

=>A+B=180-90

=>A+B=90............(1)

Now,

cos(A+B)

=cos 90 [Using 1]

=0

So,the correct option is (B).