Question

if A=30',then prove that sin(A+30)+cos(A+60)=cos A​

Answer 1

Answer:

sin(30+30)+cos(30+60)

=sin60+cos90

=

$\sqrt{3} \div 2 + 0$

=

$\sqrt{3} \div 2$

cos30=

$\sqrt{3} \div 2$

Step-by-step explanation:

hence proved