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calculate the value of sin(-45) without using calculator

Aakriti Poudel , 8 Years ago
Grade 10
anser 2 Answers
CHALLA NAVNEESWAR REDDY

Last Activity: 8 Years ago

we know that,
sin(-x) =-sin x
therefore
from sin(-45),
=-sin45      =  we know that  sin 45=1/root 2
therefore  sin(-45)  = -sin45     =-1/root2

Vinay

Last Activity: 8 Years ago

sin(-45) = sin(0-45)
=> sin(a-b) = sin(a)cos(b) – sin(b)cos(a)
so,
      sin(0-45) = sin(0)cos(45) – sin(45)cos(0)
                    = 0 – (1/sqrt(2))1
                    = -1/sqrt(2)

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