abhas
Active member
 |  Subject: icse trignomety ques Thu Dec 13, 2007 10:48 pm | |
| solve this ques
Trigonometry:given that : sin a + cos a=1 hence prove that sin a - cos a= +1
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abhas
Active member
| | Subject: answer it Thu Dec 13, 2007 11:02 pm | |
| u can answer it at yahoo answer as well click here
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abhas
Active member
| | Subject: solved Fri Dec 14, 2007 11:40 am | |
| solved by mbdwy at yahoo answers
sina cosa=1 --->square both sides
sin^a cos^2a 2sin cosa =1
1 2sina cosa =1
2sina cosa =0
so
(sina -cosa)^2 = sin^2 a cos^2 a -2sina cosa =1 - 0 = 1
so
(sina - cosa)^2 =1
sina -cosa = /-1
so
either
sina - cosa =1
or sina -cosa = -1
solved by mbdwy at yahoo answers
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