Question

sin2 30×sin2 45+sin2 60×sin2 90​

Answer 1

Answer:

$sin^2 30*sin^2 45+sin^2 60*sin^2 90\\\\(sin30)(sin30)*(sin 45)(sin 45)+(sin 60)(sin 60)*(sin 90)(sin 90)\\\\(\frac{1}{2}*\frac{1}{2})*( \frac{1}{\sqrt{2} }*\frac{1}{\sqrt{2} })+(\frac{\sqrt{3} }{2}*\frac{\sqrt{3} }{2} )*(1*1)\\\\\frac{1}{4}*\frac{1}{2}+\frac{3}{4} \\\\ \frac{1}{8} +\frac{3}{4}\\\\\frac{1+6}{8} \\\\\ \frac{7}{8}$