Kpoprocks21 Kpoprocks21

17-06-2016
Mathematics

contestada

Use the half-angle identity to find the exact value of sin 105 degrees.
Please help

Respuesta :

17-06-2016

Hello,

cos 2a=1-2sin²a==>2sin²a=1-cos2a

cos (105°*2)=-cos(30°)=-√3/2
==>2sin²105°=1+√3 /2=(2+√3)/2
==>sin²105°=(2+√3)/4
==>sin 105°=1/2*√(2+√3)

Answer Link

Otras preguntas

What are the positive and negotiate effects on a county when emigrants leave?

Which American president's name was used to label the settlements of makeshift houses built by homeless people during the Great Depression

Which statement defines Colonialism? "The spread of Christianity by European people in America" "The policy of extending political and economic control over a

Sula's grandmother visits every fifth month. Her grandfather visits every sixth month. The ladt time they both visited in the same month was January, 1995 when

Which nation rejected the Treaty of Versailles, negotiating its own peace agreement with Germany in 1921?

What animals specifically adapted to the temperate forest and how

Can someone explain major and minor arcs in relation to circles.

Many plant cells have very large membrane-covered organelles that can store water and other liquids. What is the name of this organelle?

. Interjections are used most commonly in A. memos. B. speech. C. business letters. D. formal reports.

Why was gerrymandering made illegal? What problems could result if this practice were used? Why does it make elections unfair and inaccurate?