Question

2 tan ²61÷cot²39+3 cos 21÷sin 69​

Answer 1

Answer:

SinAcosB+cosAsinB= sin(A+B)

So, sin21cos69+cos21sin69= sin(21+69)

= Sin(90)

= Sin(28π+(90–28π))

= Sin(90–28π)≈0.89.

Note : I have assumed that angle is in radians because you have not put the symbol of '°’ so by default it is in radians.

If angle is in degrees then answer is sin90°= 1.

Step-by-step explanation:

l hope it helps you if then mark brainliest and follow me