Hi, can someone show me how to prove that

sin A + cos A = (the square root of 2) sin ( A + pi over 4) ?

Thanks, any help would be very much appreciated!

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- Feb 3rd 2011, 09:58 PMsammysparrowHelp Needed with this Trigonometric Proof
Hi, can someone show me how to prove that

sin A + cos A = (the square root of 2) sin ( A + pi over 4) ?

Thanks, any help would be very much appreciated! - Feb 3rd 2011, 10:06 PMharish21

now use where - Feb 4th 2011, 07:13 AMSoroban
Hello, sammysparrow!

Quote:

Multiply the left side by

. . .[1]

Note that: .

Then [1] becomes: .

- Feb 4th 2011, 12:55 PMArchie Meade
- Feb 6th 2011, 06:05 PMsammysparrow
(Hi) Thanks everyone!