Grade 1010 grade maths
calculate the value of sin(-45) without using calculator
calculate the value of sin(-45) without using calculator
2 Answers
CHALLA NAVNEESWAR REDDY
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
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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