How to make a number line
2 answers:
first just draw a straight line , with arrows on both points on the line
then , on the line , take a distance of 1 cm and draw more smaller lines
mark the mid point as 0 and to the right write positive no.s like 1 2 3
and to the left write negative no.s like -1 -2 -3 ect .
i would like to attach a picture to make it more clear to u
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Given:
To find:
The exact value of cos 15°.
Solution:
Using half-angle identity:
Using the trigonometric identity:
Let us first solve the fraction in the numerator.
Using fraction rule:
Apply radical rule:
Using :