The price of sugar increased by 10%. A family of 5 members did not want to increase their expenditure. What is the percentage reduction in their consumption of sugar?
Find the value of \( \cos ^{2}(270- \)∅\( ) - \sin ^{2}(180- \)∅\( ) + \sin ^{2} \frac{\pi}{2} \sin ^{2}(270- \)∅).
\( \cos ^{2} \)∅
sin²\(\frac{\pi}{2}\)
\( \sin ^{2}( \)∅)−1
\( \sin ^{2} \)∅