Question

from the value of cos 30, deduce the value of sin 15,cos 15 and tan 15.​

Answer 1

Answer:

value of cos30 is

$\cos(30) = \sqrt{3} \div 2$

Step-by-step explanation:

cos(45-30)=cos45cos30+sin45sin30

$1 \times \sqrt{3} \div 2 + 1 \times 0.5 \\ \sqrt{3} \div 2 + 1 \div 2 \\ ( \sqrt{3} + 2) \div 2$