Question

If sin A =3/4, calculate cos A and tan A

Answer 1

Answer:

cos 48.59 =  0.66

tan 48.59 = 1.13388

Step-by-step explanation:

sin A = 3/4

3/4 = 0.75

A = asin(0.75)

A = 48.59 in degree

cos A = cos 48.59 =  0.66

tan A = tan 48.59 = 1.13388

Answer 2

Given that,

• $\rm { sin \: A = \dfrac{3}{4} }$

We have to find,

• $\rm { cos \: A \: and \: tan \: A }$

Solution,

Here, we know that

$\rm { sin \: A =\dfrac{ 3}{4} = \dfrac{ Perpendicular}{Hypotenuse} }$

Hence,

• $\rm { Perpendicular = 3}$
• $\rm { Hypotenuse = 4}$

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Applying pythagoras property-

$\rm\red { {H}^{2} = {B}^{2} + {P}^{2} }$

$\rm { \leadsto {B}^{2} = {H}^{2} - {P}^{2} }$

$\rm { \leadsto {B}^{2} = {4}^{2} - {3}^{2} }$

$\rm { \leadsto {B}^{2} = 16 - 9 = 7}$

$\rm\blue { \leadsto B = \sqrt{7} }$

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• $\rm { Hypotenuse = 4 }$
• $\rm { Base = \sqrt{7} }$
• $\rm { Perpendicular = 3 }$

$\leadsto \rm\red{ cos \: A = \dfrac{ Base}{ Hypotenuse} = \dfrac{ \sqrt{7} }{4} }$

$\:$

$\leadsto \rm\red{ tan \: A = \dfrac{ Perpendicular}{ Base} = \dfrac{ 3 }{\sqrt{7}} }$