Page 116 - Math SL HB Sem 1

CIRCULAR FUNCTIONS AND TRIGONOMETRY

EXPRESSION aCos a + bSin d

acos d + bsin a= rcos (a +u )

:
asin a + bcos a rsin (a +a) where r - ,{n .b'

Example l: Express 3sind - 2cosd as rsin (0 - a)

Example 2: Solve the equation 5cos x + 12 sin x = 6.5 lor 0 1x<2n

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