Sin^2 a = 1-cos^2 a = 1-25/34=9/34
sin a = 3/√34
tga = sina/cosa = 3/√34 * (-√34/5) =-3/5
Ромб.............................................
sin(x-y)=sinxcosy-sinycosx
2sin15°+cos45°=2sin(60°-45°)+cos45°=
=2sin60°cos45°-2sin45°cos60°+cos45°=
=2×(√3/2)×(√2/2) - 2×(√2/2)×1/2 + (√2/2)=
=2×(√6/4) -(√2/2) + (√2/2)=2(√6/4)=√6/2