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Calculate the value of 4tan & # 178; π / 4-cos & # 178; π / 3-1 / 2Sin & # 178; π / 6 + sin π / 2 * cos0
The original formula = 4 × 1 & # 178; - (1 / 2) & # 178; - 1 / 2 × (1 / 2) & # 178; + 1 × 1
=4-1/4-1/8+1
=37/8
cos(A+B)=?sin(A+B)=?
sin（A＋B）＝sinAcosB＋cosAsinB
cos（A＋B）＝cosAcosB-sinAsinB
What is the relationship between sin cos Tan and angle a B C?
If sinc = sin (a + b), how many relationships are there like this?
cos(A+B)=-cos(C)
tan(A+B)=-tan(C)
A. Any two of B and C can be interchanged
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