To begin with, the question can be correctly put as 2versinA+cos2A = 1+ versin2A.
Before proceeding with the proof, the definition of versin may be recollected. According to the definition versinA= 1-cosA.
To begin with, the question can be correctly put as 2versinA+cos2A = 1+ versin2A.
Before proceeding with the proof, the definition of versin may be recollected. According to the definition versinA= 1-cosA.