Question

Is it correct to say that sinA =cos (90-A)why?

Answer 1

Answer:

answer in the explanation

Step-by-step explanation:

yes it is true

we know that, sin 30 = 1/2

                      cos 60 = 1/2

hence , sin 30 = cos 60 = cos (90-30)

and also for , sin 45 = 1/√2

                     cos 45 = 1/√2

hence , sin 45 = cos 45 = cos (90-45)

and also for , sin 60 = √3/2

                     cos 30 = √3/2

hence , sin 60 = cos 30 = cos (90-60)

so we can say that , sin A = cos (90-A)