Question

Sin 42degree cos 48degree + sin 48degree cos42degree

Answer 1

Answer:

ANSWER IS 1

Step-by-step explanation:

sin42°×cos48°+sin48°×cos42°

⇒sin42°×cos(90°-42°)+sin(90°-42°)×cos42°

⇒sin42°×sin42°+cos42°×cos42°     [sin(90°-Θ)=cosΘ]  [cos(90°-Θ)=sinΘ]

⇒sin²42°+cos²42°      [sin²Θ+cos²Θ=1]

⇒1