Question

3. If sin 70°+cos50°= k, find the value of cos20°+sin40°​

Answer 1

Answer:

(sin 70 + cos 40) / (cos 70 + sin 40)

= (sin 70 + sin 50) / (cos 70 + cos 50)

= (sin(60+10) + sin(60-10)) / (cos(60+10) + cos(60-10))

= 2sin60cos10/(2cos60cos10)

= tan60

=

Step-by-step explanation:

Answer 2

K
See the photo attached for solution