Question

Find the value of cos35°+cos155°+cos 420°​

Answer 1

Answer:

kindly see the answer below...

Step-by-step explanation:

Here, we have to find the value of

cos35°+cos155°+cos420°

$= \cos(35) + \cos(180 - 35) + \cos(2 \times 180 + 60)$

$= \cos(35) - \cos(35) + \cos(60)$

$= \cos(60)$

$= \frac{1}{2}$

thanks a lot...