Question

tan^2 theta – 1/cos^theta = –1


Please answer this is my tests question.please help me please answer..​

Answer 1

Here is step by step solution. Please excuse my handwriting

Answer 2

Step-by-step explanation:

tan^2 theta – 1/cos^2 theta = –1

(using , thita = 0°)

tan² 0° – 1/cos² 0° = –1

0² – 1/1² = –1

0 - 1/1 = -1

=> –1 = –1

hence proved.