Question

Please help, I legit am not sure what I'm supposed to do ​

Answer 1

Recall definitions:

• cosine = adjacent/hypotenuse
• sine = opposite/hypotenuse
• tangent = opposite/adjacent

Use the triangle to define each ratio.

Use Pythagorean theorem:

• a² + b² = c²

Question 1

• (sin B)² + (cos B)² =
• (b/c)² + (a/c)² =
• b²/c² + a²/c² =
• (a² + b²)/c² =
• c²/c² =
• 1

Proved

Question 2

• 1/(cos A)² - (tan A)² =
• 1/(b/c)² - (a/b)² =
• c²/b² - a²/b² =
• (c² - a²)/b² =
• b²/b² =
• 1

Proved