Question

The value of the expression cos degree 1 cos 2 degree cos 3 degree into cos 19 79 degree is equal to

Answer 1

Answer:

cos 45 = 1/2

Step-by-step explanation:

here we have to add the first and the ladt which makes cos 90

for eg

cos1 +cos 89

cos 2 + cos 88

and so on on the last u will find that cos 45 is only left therefore the answer is cos 45

which is1/2