2cos sina + cosa can be simplified using the double angle identity for cosine:
2cos sina + cosa = 2(2cos^2(sina) - 1) + cosa= 2(2cos^2(sina) - 1) + cosa= 4cos^2(sina) - 2 + cosa
Therefore, the simplified expression is 4cos^2(sina) - 2 + cosa.
2cos sina + cosa can be simplified using the double angle identity for cosine:
2cos sina + cosa = 2(2cos^2(sina) - 1) + cosa
= 2(2cos^2(sina) - 1) + cosa
= 4cos^2(sina) - 2 + cosa
Therefore, the simplified expression is 4cos^2(sina) - 2 + cosa.