Question

sin55°×cos35°+cos55°×sin35°=1​

Answer 1

Answer:

》sin55°×cos35°+cos55°×sin35°=1

》sin55°×cos(90°-55°)+cos55°×sin(90°-55°)°=1

》sin55°×sin55°+cos55°×cos55°=1

》sin^2 55° + cos^2 55° = 1

》1 = 1

Hence Proved