Note: Trigonometrical Ratios of complementary angles:

For

(i) (ii)

(iii) (iv)

(v) (vi)

Evaluate:

Answer:

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. Hence proved.

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Hence proved.

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. Hence proved.

and

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and

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and

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= RHS. Hence proved.

Answer:

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Question 37: Find if:

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Question 38: Find if:

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Question 39: Find if:

Answer:

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Therefore

Question 41: Find the value of if:

Answer:

Question 42: Find the value of if:

Answer:

Question 43: Find if:

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Question 44: Find the value of where

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Question 45: Find the value of where

Answer:

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Answer:

[2010]

Answer:

Question 49: Without using trigonometric tables, evaluate

[2014]

Answer: