Answer:
1=1
Explanation:
expand (cost - sint)²= cost² - 2costsint +sint²
(cost +sin t)² = cost² + 2sintcost+sint²
simplifying these = 2(cost²+sint²)= 2
2 will divide with 2 giving 1
çost²+sint²=1
substituting cost²= 1-sint² in above equation
1-sint²+sint²=1
giving us 1=1