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| Introduction |
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| An equation containing the trigonometrical functions of an unknown quantity is termed as a trigonometrical equation, which holds for some values (and not for all values) of the quantities involved. |
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| The value, that satisfies the equation are called the roots. |
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| The main problem of interest in connection with trigonometric equations is to find the values of unknown quantity, which satisfy the equation. |
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| The value of the unknown angle satisfying the given equation is called the solution of the given trigonometrical equation. |
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| Since, all trigonometric equations are periodic, trigonometric equations will have infinitely many solutions. |
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