Question

Find the value of sin 25° cos 65° + cos 25° sin 65º.

please help..​

Answer 1

Step-by-step explanation:

sin 25° cos 65° + cos 25° sin 65° = sin 25° cos (90° – 25°) + cos 25° sin (90° – 25°) = sin 25° sin 25° + cos 25° + cos 25° = sin2 25° + cos2 25° = 1. [∵ cos2 θ + sin2 θ = 1]

Answer 2

Answer:

1

Step-by-step explanation:

sin (A+B)= sinA.cosB + cosA.sinB

So sin (25+65) = sin 90°

= 1.