Question

$\sin(75)$

Answer 1

hi dear.
sin75 = −0.3877816
I hope you get the ans.
THANK YOU

Answer 2

We know that, 
Sin(A+B) = SinACosB + CosASinB,

Asked to find the value of SIn(75), We can write 75 as 45+30,
Now let A = 45 and B = 30 or vice-versa,

=> Sin(45+30) = Sin45Cos30 + Sin30Cos45,
=> (1/√2)(√3/2) + (1/2)(1/√2)
=> (√3)/(2√2) + (1)/(2√2)
=> (√3+1)/2√2, Here is the answer !

Hope you understand, Have a great day !!