Asymptotes are drawn incorrectly for the graph of the tangent function.A tip to remember is that you “sine up” from 0 for the sine graph so the line is increasing whereas you “cosine down” from 1 so the line is decreasing for the cosine graph. The sine and cosine graphs are very similar and can easily be confused with one another. If the inverse trig function is used instead of the standard trig function, the calculator may return a maths error as the solution does not exist. Using the inverse trig function instead, inducing a mathematical error.If the vertical height of a triangle is not available then we cannot calculate the area by halving the base times the height. Using any other angle will result in an incorrect solution. In order to use the sine rule we need to have pairs of opposite angles and sides.įor the cosine rule and the area of a triangle using A=1/2absin(C), the angle is included between the two sides. Using the sine rule instead of cosine rule.
Use the flowchart to help you to recognise when to use Pythagoras’ Theorem and when to use trigonometry. Always use as many decimal places as possible throughout the calculation, then round the solution. If the triangle is incorrectly labelled it can lead to the use of the incorrect standard or inverse trigonometric function. Using the incorrect trigonometric function.This will have an impact on the formula for the sine rule, the cosine rule, and the area of the triangle. This triangle has been incorrectly labelled with the side next to the angle. Step-by-step guide: Trigonometric functions &\quad \ \ \text \quad \quad \quad \quad &
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