� 18 . ( a ) Solve sin5x�cos4x� 0 , for 0 � x � .
2 [ 2 ]
( b ) Is it true that there are four distinct real roots for the equation � sin10x�cos8 x� 0, for 0 � x � ? Using ( a ) to explain your answer . 4
[ 3 ] ( c ) Write down the number of solution ( s ) of sin5x�cos4 x� 1 for �6� x � 0.
[ 1 ]
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