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cos( a+ b) = 0
a+ b= 90
a= 90-b
Sin(a - b)= sin( 90-b-b)= sin( 90-2b) = cos 2b
a+ b= 90
a= 90-b
Sin(a - b)= sin( 90-b-b)= sin( 90-2b) = cos 2b
Answered by
0
cos ( a + b) = 0
a + b =90
sin ( a - b) = sin ( 90 - b - b)
= sin (90 -2b)
= cos 2b
a + b =90
sin ( a - b) = sin ( 90 - b - b)
= sin (90 -2b)
= cos 2b
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