help

Question

0

468

2

Simplify sin(105) + cos(105). (All angles are in degrees.)

Guest Dec 17, 2019

ElectricPavlov · Answer 1 · 2019-12-17T11:08:31

+36916

+1

sin (60 + 45) + cos (60 + 45) = do you remember angle sum trig identities?

edited by ElectricPavlov Dec 17, 2019
edited by ElectricPavlov Dec 17, 2019

+36916

+1

Sin (A+B) = SInA CosB + sinB Cos A

and

Cos(A+B) = cos A Cos B - Sin A Sin B

So the first 1/2 would be

sqrt3/2 * sqrt2/2 + sqrt2/2 * 1/2

to this you would add the Cos (A+B) part

edited by ElectricPavlov Dec 17, 2019