**1.**To simplify trigonometric expressions using identities.**1.1.**Carry out basic operations with algebraic expressions.**1.2.**Complete substitutions in algebraic expressions.**1.3.**Recognize and apply basic trigonometric identities to rewrite a trigonometric expression.

**2.**To develop algebraic expressions that involve the use of trigonometric ratios.**3.**Transform algebraic expressions to find or validate equal expressions.**3.1.**Rewrite trigonometric expressions in terms of sine and cosine.**3.10**Apply the identities for double-angle and half-angle for problem solving.**3.11.**Practice the correct use of Demonstrative pronouns as a tool to review studied content.**3.2.**Factorize and/or simplify expressions that involve trigonometric ratios.**3.3.**Perform basic operations with expressions that involve trigonometric ratios.**3.4.**Relate equal trigonometric ratios.**3.5.**Recognize the identities used for addition and subtraction of angles.**3.6.**Use the identities of addition and subtraction of angles to validate equalities of trigonometric expressions.**3.7.**Apply the identities of addition and subtraction of angles for problem solving.**3.8.**Recognize the identities for double-angle and half-angle.**3.9.**Use the identities for double-angle and half-angle to validate equalities of trigonometric expressions.

**4.**To practice changing roles in a conversation.

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