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UNIT
8 :
TRIGONOMETRIC FUNCTIONS
LESSON
5: SOLVING TRIGONOMETRIC EQUATIONS
Quick
Review:
Angles
in Standard Position using the Unit Circle:
Special
Angles Table:
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1 |
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The CAST rule:
The CAST
RULE is a memory aid
which tells us the sign of the trig ratios in the various quadrants.
In the
first quadrant ALL are positive. This is denoted using the letter A.
In the
second quadrant, SINE
is positive. This is denoted by
the letter S.
[ the
other two ratios are negative ]
In the
third quadrant, TANGENT
is positive. This is denoted by
the letter T.
[ the
other two ratios are negative ]
In the
fourth quadrant, COSINE
is positive. This is denoted by
the letter C.
[ the other
two ratios are negative ].
The Unit Circle for Special Angles
Example 1:
