Question

evaluate cos^2 25+cos^2 65/sin^2 39+sin^2 51 + sin^2 30​

Answer 1

Answer:

cos^225+cos^265/sin^239+sin^251+sin^230

=cos^(180+45) +cos^(270-5) /sin^(270-31) +sin^(180+50)

=-cos^45°-sin5°/cos^31°-sin^50°

=-1/√2-sin^5°/cos^31°-sin^50°