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#### shaalaa.com | Trigonometry Part 1

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Trigonometry

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(a) Using Identities to solve/prove simple algebraic trigonometric expressions.

sin^{2} A + cos^{2} A = 1

1 + tan^{2} A = sec^{2} A

1+cot^{2} A = cosec^{2} A; 0< A<90^{0}

(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.