CAN U EXPLAIN HOW TO SOLVE THIS?!

C

Step-by-step explanation:

Use Δ ABC to find AB then Δ ABD to find DB

Δ ABC  is isosceles since ∠ CAB = ∠ CBA = 45° , then CB = CA = 2

Using Pythagoras' identity in Δ ABC , then

AB² = 2² + 2² = 4 + 4 = 8 ( take square root of both sides )

AB = = 2

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Using the sine ratio in Δ ABD with the exact value

sin60° = , then

sin60° = = = = ( cross- multiply )

× DB = 4 ( divide both sides by )

DB = ( multiply numerator/ denominator by to rationalise denominator )

     = ×

     = → C

practice. practice. practice.