shaalaa.com | Trigonometry Part 1
Series 1: playing of 4
(a) Using Identities to solve/prove simple algebraic trigonometric expressions.
sin2 A + cos2 A = 1
1 + tan2 A = sec2 A
1+cot2 A = cosec2 A; 0< A<900
(b) Trigonometric ratios of complementary angles and direct application:
sin A = cos(90 - A),cos A = sin(90 – A)
tan A = cot (90 – A), cot A = tan (90- A)
sec A = cosec (90 – A), cosec A = sec(90 – A)
(c) Heights and distances: Solving 2-D problems involving angles of elevation and depression using trigonometric tables.
Note: Cases involving more than two right angled triangles excluded.