Question

13. If cos (a + B) = 0.5, then find sin (a + B).​

Answer 1

Step-by-step explanation:

given

cos (a+b)=0.5

(a+b)=

${ \cos}^{ - 1} (0.5)$

(a+b)= 60degrees

there fore

sin(a+b)=sin60

sin (a+b=

$\frac{ \sqrt{3} }{2}$

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Answer 2

ANSWER -

cos(a+b) =0.5 (given)

cos (a+b)=½ {cos 60 =½}

cos (a+b)=cos60°

on comparison

a + b = 60 (eqn 1 )

ATQ put the value from eqn 1

sin 60 °=√3/2