Question

sin45.sin30+cos45.cos30sin 45 degree into cos 45 degree minus sin square 30 degree ​

Answer 1

Solution:

1) sin45sin30+cos30cos45

= (1/√2)(1/2)+(√3/2)(1/√2)

= 1/2√2 + √3/2√2

= (1+√3)/2√2

ii) sin45sin30-cos30cos45

= (1/√2)(1/2)-(√3/2)(1/√2)

=(1-√3)/2√2

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