Question

if sina = 1 then find cosa​

Answer 1

Answer -

Sin a = 1

a = 90°

Cos a = Cos 90° = 0

Thanks

Answer 2

Given :—
$\sin(a) = 1$

To find :—
$\cos(a)$

Identity used :—
$\boxed{ { \sin }^{2} (a) + { \cos }^{2}(a) = 1 }$

Calculations :—
$\quad \bf{ cos(a) } \red{ \leftarrow \bf question} \\ \\ = \sqrt{1 - { \sin}^{2} (a)} \\ \\ = \sqrt{1 - { \left[ \sin(a) \right] }^{2} } \\ \\ = \sqrt{1 - {(1)}^{2} } \\ \\ = \sqrt{1 - 1} \\ \\ = \sqrt{0} \\ \\ = \bf \quad 0 \red{ \longleftarrow} \green{ \bf answer}$

Conclusion :—
$\underline{ \boxed{ \quad \cos(a) = 0 \quad}}$

$\mid \underline{\underline{\LARGE\bf\green{Brainliest \: Answer}}}\mid$

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