Show that Sin 1000 – Sin 100 is positive.
Let f(x) = sin 100° – sin 10°
Dividing And multiplyingBy √(1 + 1) = √2,
We know that cosA cosB – sinA sinB = cos(A +B)
∴ f(x) = √2 cos 55°
3
Show that Sin 1000 – Sin 100 is positive.
Let f(x) = sin 100° – sin 10°
Dividing And multiplyingBy √(1 + 1) = √2,
We know that cosA cosB – sinA sinB = cos(A +B)
∴ f(x) = √2 cos 55°