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Evaluate the expression SIN² 225° - COS² 270° + TAN ² 60°
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Evaluate the expression

SIN² 225° - COS² 270° + TAN ² 60°

User Shanoor
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= ( \sin(180 + 45) )^(2) - ( \cos(180 + 90) )^(2) + ( ( √(3) )/(1) )^(2) \\ = ( - \sin(45) )^(2) - ( - \cos(90) )^(2) + 3 \\ = ( - (1)/( √(2) ) ) ^(2) - ( (0)/(1))^(2) + 3 \\ = (1)/(2) - 0 + 3 \\ = (1)/(2) + 3 \\ = (7)/(2)

ATTACHED IS THE SOLUTION

User Faheem
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