How does one evaluate -LSB- math -RSB- \ cos -LCB- \ theta -RCB- + \ sec -LCB- \ theta -RCB- -LSB- / math -RSB- , given that -LSB- math -RSB- 4 \ cos ^ 2 -LCB- \ theta -RCB- +4 \ sec ^ 2 -LCB- \ theta -RCB- = 5 -LSB- / math -RSB- ?
How do I evaluate cosθ + secθ given that 4cos ² θ +4 sec ² θ = 5 ?