exam Maths Puzzle Numerical Ability

Triangle DEF is circumscribed about circle O with DE=15 units, DF=12 units, and EF=13 units. Find the length of each segment whose endpoints are D and the points of tangency on DE

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exam Other Question

Could I please get some assistance with the following problem:

Write
4[cos (3pi)/4 + i sin (3pi)/4] in the form a + bi

Thank You
RF We are studying nth roots and rational exponents and I need help!
Problem:
4/square root of 176 + 4/square root of 11=
Problem: How do you type in the square root of problems using symbols?