1.

If A,B and C be the angles of a triangle, then put of the following. the incorrect relation is :1). $sin\frac{A+B}{2}$ = $cos\frac{C}{2}$2). $cos\left(\frac{A+B}{2}\right) = $sin\frac{C}{2}$3). $tan\left(\frac{A+B}{2}\right) = $sec\frac{C}{2}$4). $cot\left(\frac{A+B}{2}\right) = $tan\frac{C}{2}$

Answer»

$cos\left(\FRAC{A+B}{2}\right) = $sin\frac{C}{2}$ is the best suited



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