Prove that sin10 sin30 sin50 sin70 = 1/16
I didnt understand these steps:
=1/2( 3/4 -sin210) sin10
=1/8( 3 - 4sin210 ) sin10
=1/8( 3sin10 - 4sin310 )
=1/8( sin 3X10)
=1/16
Culd u suggest me another method??
Here it is a simple method to understand.
The bracket term is sin3A formula,
sin3A = 3sinA -4sin3A
After that the expression in the bracket is written as sin3A, here A is 10.
Hope you have got it.
The bracket term is sin3A formula,
sin3A = 3sinA -4sin3A
After that the expression in the bracket is written as sin3A, here A is 10.
Hope you have got it.