Question

Sin215+sin225+sin265+sin275 the value is and I need the exact solevd solution

Answer 1

Answer:

sin265∘+sin225∘+cos235∘+cos255∘ ⇒sin265∘+sin2(90∘−65∘)+[cos235∘+cos2(90∘−35∘)] ⇒(sin265∘+cos265∘)+(cos235∘+sin235∘) ⇒1+1 ⇒2