Math, asked by chinnupoojya, 9 months ago

hey there!
if ABCD is a quadrilateral then cos ( A+B/2)+ cos(C +D/2)​

Answers

Answered by Pkkanpur1990gmailcom
0

Step-by-step explanation:

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Answered by priyaayika
2

Answer:

a + b + c + d = 360degrees

a + b = 360 - (c + d)

now

 = cos( \frac{a + b}{2} ) + cos( \frac{c + d}{2} )

 = cos( \frac{ 360 - (c + d)}{2} ) + cos( \frac{c + d}{2} )

 = cos(360 -  \frac{c + d}{2} ) + cos( \frac{c + d}{2} )

 = cos( \frac{c + d}{2} ) + cos( \frac{c + d}{2} )

 = 0

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