1.

2sin^2 (8×1/2)+4cos16sin (7×1/2)sin (8×1/2)+cos32 =?​

Answer»

we know that sin2A-sin2B = sin (A+B)sin(A-B)π/8 + a/2+π/8 - a/2) sin(π/8 + a/2-π/8+ a/2)sin^2[π÷8+A÷2]-sin^2[π÷8-A÷2]=sin(π/4) sin(a)=sin(=(1/ ) sina .......

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