2 tan ²61÷cot²39+3 cos 21÷sin 69
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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.
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