m sinq +n cosq =p, m cosq - n sinq =q m ^2+n^2=p^2+q^2
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Step-by-step explanation:
m Sin Ф + n Cos Ф = p
=> m² Sin² Ф + n² Cos² Ф + 2 m n Sin Ф Cos Ф = p²
m Cos Ф - n Sin Ф = q
=> m² Cos² Ф + n² Sin²Ф - 2 m n Sin Ф Cos Ф = q²
add the two equations:
m² (sin²Ф +Cos²Ф) + n²(sin²Ф+Cos²Ф) = p² + q²
m² + n² = p² + q²
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