Question

1)a^2×cos O°-2ab×sin 90°+t^2×tg^2 45
2)a^2×sin180°+2ab×cos90°+b^2×tg 45°

Answer 1

cos0° = 1; sin90° = 1; tg²45° = 1
1) a² - 2ab + t²

sin180° = 0; cos90° = 0; tg45° = 1
a²*0 + 2ab*0 + b² = b²