Verifiy the following identites letting @=theta. 1. cos@= sec@ - sin@tan@ 2. sin@ cos@ ----- + ----- = 1 csc@ sec@
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1) Factorise the right side by $\displaystyle \frac1{\cos\alpha}$ 2) Rember that $\displaystyle \csc\alpha=\frac1{\sin\alpha}$ and $\displaystyle \sec\alpha=\frac1{\cos\alpha}$
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