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### Theory

 1 Trigonometric ratios of complementary angles 2 Trigonometric identities

### Exercises

 1 Find the complementary angle Difficulty: easy 2 2 Simplify the following Difficulty: easy 3 3 Find the value of 'α' Difficulty: easy 2 4 Trigonometric identity Difficulty: easy 2 5 Express in terms of the ratio 'sin' Difficulty: easy 2 6 Express in terms of the ratio 'cot' Difficulty: easy 2 7 Express in terms of the ratio 'sec' Difficulty: easy 2 8 Simplify the expression Difficulty: medium 4 9 Evaluate the given expression Difficulty: medium 4 10 Simplify and choose the equivalent expressions Difficulty: medium 4 11 Simplify the given expression by matching correct options Difficulty: medium 5 12 Express the given ratios in terms of trigonometric ratios of angles between 0° and 45° Difficulty: medium 2 13 Choose the correct answer by using complementary angles Difficulty: medium 4 14 Simplify and select the equivalent expressions Difficulty: medium 4 15 Prove the given trigonometric equation Difficulty: medium 4 16 Evaluate the given expression by matching correct options Difficulty: medium 4 17 Explain the given trigonometric equation by matching correct options Difficulty: medium 4 18 Find the value of the given trigonometric expression Difficulty: medium 4 19 Verify the given trigonometric equation Difficulty: hard 5 20 Choose the correct answer Difficulty: hard 5 21 Show the given trigonometric equation Difficulty: hard 5 22 Find the value of 'A' Difficulty: hard 5 23 Pick the correct statement: Trigonomentric identities Difficulty: hard 5 24 Select the correct answer Difficulty: hard 4

### Tests

 1 Training test I Difficulty: medium 9 2 Training test II Difficulty: medium 7 3 Training test III Difficulty: medium 8 4 Training test IV Difficulty: medium 8

### Teacher manual

 1 Methodical recommendation