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Trigonometric Functions

Short Answer Type

461.

In $increment ABC comma$ show that:

$left parenthesis straight a plus straight b right parenthesis sec 1 half left parenthesis straight A minus straight B right parenthesis space equals space 4 space straight R space cos open parentheses 1 half straight C close parentheses$

111 Views

462.

The area of triangle ABC is 54 cm² and its perimeter is 9 cm, find the radius of its incircle.

108 Views

Long Answer Type

463.

In $ΔABC comma$ $8 straight R squared space equals space straight a squared plus straight b squared plus straight c squared comma$ show that the triangle is right angled.

111 Views

Short Answer Type

464.

Express in degree measure:

$straight pi over 8$

100 Views

465.

Express in degree measure:

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