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Sin A+ Cos A=0 Then Find A Please give the solution

Sin A+ Cos A=0
Then Find A
Please give the solution

Grade:11

1 Answers

surya
40 Points
9 years ago
sina+cosa=0
-->sina= -cosa
-->squaring on both sides
-->sin(sq)a=cos(sq)a
-->1-cos(sq)a=cos(sq)a
-->1=2cos(sq)a
-->cos(sq)a=1/2
-->cosA=1/v 2 
-->A=45 or 135

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