Trigonometry 3

Question 1

Trigonometric identity 1

Answer 1

cos^2 A + sin^2 A = 1 and is true for all A such that 0° < A < 90°

Question 2

Trigonometric identity 2

Answer 2

1 + tan^2 A = sec^2 A and is true for all A such that 0° < A < 90°.

Question 3

Trigonometric identity 3

Answer 3

cot^2 A + 1 = cosec^2 A and is true for
all A such that 0° < A < 90°