Question

Express each of the terms of trigonometric ratios of angles between 0 degree to 45 degree tan 81 + cos 72

Answer 1

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Answer 2

$\huge{ \color{aqua}{ \underbrace{ \underline{ \color{lime}{ \mathbb{✯꧁ ⋆᭄ SoLuTiOn⋆᭄꧂✯ }}}}}}$

$\bold{ \tt{ \underline{ \underline{ \red{given \ratio - }}}}}$

$\tt {= tan \: 81 {}^{0} + cos \: 72 {}^{0} }$

$\bold{ \underline{ \underline{ \tt{ \blue{according \: to \: the \: question \ratio - }}}}}$

$\tt {= tan(90 {}^{0} - 9 {}^{0} ) + cos(90 {}^{0} - 18 {}^{0} }$

$\tt{= cot \: 9 {}^{0} + sin \: 18 {}^{0}}$