Question

Cos 45 degree × cos 30 degree + sin 45 degree × sing 30 degree

Answer 1

Answer:

√3 +1/ 2√2

Explanation:

Cos 45 degree = 1/√2

sin 45 degree= 1/√2

cos 30 degree = √3/ 2

Sim 30 = 1/2

Now, put the values

(1/√2× √3/ 2 ) + 1/√2 × 1/2

= √3 +1/ 2√2

Marks it as brainliest please.

Answer 2

cos 45°×cos30°+sin45°×sin30°= (1/√2×√3/2)+(1/√2×1/√2) [since cos 45°=sin45°=1/

√2,cos30°=√3/2,sin30°=1/√2]

=√3/2√2+1/2√2 =(√3+1)/2√2and it can be further done as (√3+1)(-2√2)/2√2×(-2√2) =(√3+1)(-2√2)/-4×2 =(√3+1)/8