anonymous
  • anonymous
cos(pi/2-x)=sin(x) True or False
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
false, doesn't work out
anonymous
  • anonymous
false
zzr0ck3r
  • zzr0ck3r
\(\cos(A-B) = \cos(A)\cos(B)+\sin(A)\sin(B)\) So in fact \(\cos(\dfrac{\pi}{2}-x)=\cos(\dfrac{\pi}{2})\cos(x)+\sin(\dfrac{\pi}{2})\sin(x)=0*\cos(x)+1*\sin(x)=\sin(x)\)

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zzr0ck3r
  • zzr0ck3r
@plohrb @Dwayne_Johnson This is the problem with just giving answers...
freckles
  • freckles
this is also cofunction identity compare cos(pi-x) 's ratio and sin(x)'s ratio |dw:1441062161511:dw|
dinamix
  • dinamix
@Reid448 its true and we find it in (Equilateral triangle ,Triangle-based) right mr @freckles
freckles
  • freckles
equilateral triangle is a triangle with each of its angle measurements equal to 60 deg
dinamix
  • dinamix
i mean should be based and equilateral
dinamix
  • dinamix
the triangle
zzr0ck3r
  • zzr0ck3r
thanks @freckles that is cool, I always have to look it up.

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