Question

if cos + sin = 2cos show that cos- sin = 2sin​

Answer 1

Step-by-step explanation:

hope it will help you

Answer 2

Answer:

its answer is

Step-by-step explanation:

see

cos+sin=2cos

sin=2cos-cos

sin=cos_ _ _(i)

cos-sin=2sin

cos-sin=2cos (fromi)

cos-sin=cos+sin

cos-cos=sin+sin

sin-cos=2sin (from i)

Hence proved