exam Maths Puzzle Numerical Ability

help verifying the identity

sin^2(theta/2)=csc(theta)-cot(theta)/2csc theta

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exam Other Question

Identify the degree of each term of the polynomial and the degree of the polynomial.

-9x^3+9x^2+6x+8

degree of first term:
degree of second term:
degree of third term:
degree of fourth term:
degree of polynomial:
y^4-y^2=40y-10y^3