Question

value for sin^2 5°+sin^2 10°+sin^2 80°+sin^2 85° is

pls its an urgent frnds i want with the process

Answer 1

Sin²5°+sin²10+Sin²80+Sin²85
Sin²(90-85)+Sin²85+Sin²80+sin²(90-80)
Cos²85+Sin²85+Sin²80+Cos²80
1+1=2

Answer 2

${sin}^{2} 5 + {sin}^{2} 10 + {sin}^{2} 80 + {sin}^{2} 85$
${sin}^{2} (90 - 85) + {sin}^{2} (90 - 80) + {sin}^{2} 80 + {sin}^{2} 85$
now

${cos}^{2} 85 + {sin}^{2} 85 + {cos}^{2} 80 + {cos}^{2} 80$
$1 + 1 = 2$