Question

the value of sin 45 into cos 30 - cos 45 into sin 30​

Answer 1

Answer:

value of sin 45 equals to 1/root 2

Answer 2

Step-by-step explanation:

sin45cos30-cos45sin30

we know that

sin(a-b)= sina cosb - cosa sinb

but instead of do this keep the value of

sin 45=cos45=1/√2

cos 30=√3/2

sin30=1/2

1/√2×√3/2 - 1/√2×1/2

√3/2√2 -1/2√2

√3-1/2√2= sin15°