HP 35s Manual page 5

Solving trigonometry problems

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HP 35s Solving Trigonometry Problems

Then, enter the Y magnitude, press the 6 key, and enter the X magnitude. Then press Ï.

8z65zÏ

Answer:

The vector direction is very nearly –148 degrees as indicated by the value shown after the Θ.

Example 7: A program is being written to automate calculations with vectors. The program needs to know whether the

Y component of directions in calculations such as the above is in the +Y or the –Y direction. How can the

direction be obtained?

Solution:

The SIGN function (the first choice in the ¹gmenu) gives the sign of a number, +1 or –1. Thus it is

enough to obtain the sign of the angle calculated in the previous example and to check whether it is +1 or –

In RPN mode follow the above calculation with:

¹=¹gÏ

In algebraic mode follow the above calculation with:

¹gÏ¹=ºÍÏ

Answer:

The sign is –1, so the vector direction is down, not up. Note that theÏ following ¹g will

choose the first option in the displayed menu.

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Figure 9

Figure 10

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HP 35s Solving Trigonometry Problems - Version 1.0