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Question
secondary 3 | A Maths
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Date Posted: 4 years ago
Views: 219
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"... without evaluating A or B, ..." means we do not calculate out the actual angles in terms of degrees or radians.
Instead, we sketch out the angles and use Pythagoras theorem to determine the other trigonometric ratios.
Use compound angle formulas to work out final answer.
Instead, we sketch out the angles and use Pythagoras theorem to determine the other trigonometric ratios.
Use compound angle formulas to work out final answer.
Date Posted:
4 years ago
From the diagram, since A is in 1st quadrant, shouldnt cos A = -7/25 ?
remember your A S T C
in 1st quadrant All positive
in 2nd quadrant Sin positive
in 3rd quadrant Tan positive
in 4th quadrant Cos positive
so in 1st quadrant, cos A = (+)7/25.
it is good that you request to clarify things that you are not sure.
in 1st quadrant All positive
in 2nd quadrant Sin positive
in 3rd quadrant Tan positive
in 4th quadrant Cos positive
so in 1st quadrant, cos A = (+)7/25.
it is good that you request to clarify things that you are not sure.
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The numbered steps are the thought process you should follow.
Date Posted:
4 years ago
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