Kuna P.

asked • 06/04/16

could some one help me out?

how can I proof that( sine alpha + cos alpha) <= 1/2, using the fact that sine (- beta) and cos (-beta) = cos beta?

Arturo O.

The statement
sinα + cosα ≤ 1/2
is not correct in general.  For example, if α = π/2, then
sinα + cosα = sin(π/2) + cos(π/2) = 1 + 0 > 1/2
In addition,
sin(-β) = -sinβ
cos(-β) = cosβ
Is there some other information in the statement of the problem?


1 Expert Answer


Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.


Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.