Sin 75 + sin 15 = Mohon bantuannya ya kak

sin 75 = sin (120 - 45)
= (sin 120 x cos 45) - (cos 120 x sin 45)
= (\frac{1}{2} \sqrt{3}​2​​1​​√​3​​​ x \frac{1}{2} \sqrt{2}​2​​1​​√​2​​​ ) - (\frac{-1}{2}​2​​−1​​ x \frac{1}{2} \sqrt{2}​2​​1​​√​2​​​ )
= \frac{1}{4} \sqrt{6}​4​​1​​√​6​​​ + \frac{1}{4} \sqrt{2}​4​​1​​√​2​​​ 
= 0,965..

Sin 15
sin 45.cos30-cos45.sin30
=\frac{1}{2} \sqrt{2} - \frac{1}{2} \sqrt{3} - \frac{1}{2} \sqrt{2} \frac{1}{2}​2​​1​​√​2​​​−​2​​1​​√​3​​​−​2​​1​​√​2​​​​2​​1​​ 
=\frac{1}{2} \sqrt{6} - \frac{1}{2} \sqrt{2}​2​​1​​√​6​​​−​2​​1​​√​2​​​ 
=\frac{1}{2} ( \sqrt{6} - \sqrt{2} )​2​​1​​(√​6​​​−√​2​​​)